Merge branch 'master' into s3partitionedwrite

2024-11-21 23:21:59 +00:00 · 2021-08-24 10:03:57 +03:00 · 2021-08-24 10:03:57 +03:00 · 98acccbdcc
commit 98acccbdcc
parent 6fe63a80bc 355cc09004
121 changed files with 4176 additions and 130 deletions
--- a/SECURITY.md
+++ b/SECURITY.md
@ -1,9 +1,11 @@
 # Security Policy

-## Supported Versions
+## Security Announcements
+Security fixes will be announced by posting them in the [security changelog](https://clickhouse.tech/docs/en/whats-new/security-changelog/)

-The following versions of ClickHouse server are
-currently being supported with security updates:
+## Scope and Supported Versions
+
+The following versions of ClickHouse server are currently being supported with security updates:

 | Version | Supported          |
 | ------- | ------------------ |
@ -11,18 +13,49 @@ currently being supported with security updates:
 | 18.x   | :x:                |
 | 19.x   | :x:                |
 | 20.1   | :x: |
-| 20.3   | :white_check_mark: |
+| 20.3   | :x: |
 | 20.4   | :x: |
 | 20.5   | :x: |
 | 20.6   | :x: |
 | 20.7   | :x: |
-| 20.8   | :white_check_mark: |
+| 20.8   | :x: |
 | 20.9   | :x: |
 | 20.10  | :x: |
-| 20.11  | :white_check_mark: |
-| 20.12  | :white_check_mark: |
-| 21.1   | :white_check_mark: |
+| 20.11  | :x: |
+| 20.12  | :x: |
+| 21.1   | :x: |
+| 21.2   | :x: |
+| 21.3   | ✅ |
+| 21.4   | :x: |
+| 21.5   | :x: |
+| 21.6   | ✅ |
+| 21.7   | ✅ |
+| 21.8   | ✅ |

 ## Reporting a Vulnerability

+We're extremely grateful for security researchers and users that report vulnerabilities to the ClickHouse Open Source Community. All reports are thoroughly investigated by developers.
+
 To report a potential vulnerability in ClickHouse please send the details about it to [clickhouse-feedback@yandex-team.com](mailto:clickhouse-feedback@yandex-team.com).
+
+### When Should I Report a Vulnerability?
+
+- You think you discovered a potential security vulnerability in ClickHouse
+- You are unsure how a vulnerability affects ClickHouse
+
+### When Should I NOT Report a Vulnerability?
+
+- You need help tuning ClickHouse components for security
+- You need help applying security related updates
+- Your issue is not security related
+
+## Security Vulnerability Response
+
+Each report is acknowledged and analyzed by ClickHouse maintainers within 5 working days.
+As the security issue moves from triage, to identified fix, to release planning we will keep the reporter updated.
+
+## Public Disclosure Timing
+
+A public disclosure date is negotiated by the ClickHouse maintainers and the bug submitter. We prefer to fully disclose the bug as soon as possible once a user mitigation is available. It is reasonable to delay disclosure when the bug or the fix is not yet fully understood, the solution is not well-tested, or for vendor coordination. The timeframe for disclosure is from immediate (especially if it's already publicly known) to 90 days. For a vulnerability with a straightforward mitigation, we expect report date to disclosure date to be on the order of 7 days. 
+
+
--- a/base/common/insertAtEnd.h
+++ b/base/common/insertAtEnd.h
@ -0,0 +1,28 @@
+#pragma once
+
+#include <vector>
+
+/// Appends a specified vector with elements of another vector.
+template <typename T>
+void insertAtEnd(std::vector<T> & dest, const std::vector<T> & src)
+{
+    if (src.empty())
+        return;
+    dest.reserve(dest.size() + src.size());
+    dest.insert(dest.end(), src.begin(), src.end());
+}
+
+template <typename T>
+void insertAtEnd(std::vector<T> & dest, std::vector<T> && src)
+{
+    if (src.empty())
+        return;
+    if (dest.empty())
+    {
+        dest.swap(src);
+        return;
+    }
+    dest.reserve(dest.size() + src.size());
+    dest.insert(dest.end(), std::make_move_iterator(src.begin()), std::make_move_iterator(src.end()));
+    src.clear();
+}
--- a/base/common/unit.h
+++ b/base/common/unit.h
@ -0,0 +1,10 @@
+#pragma once
+#include <cstddef>
+
+constexpr size_t KiB = 1024;
+constexpr size_t MiB = 1024 * KiB;
+constexpr size_t GiB = 1024 * MiB;
+
+constexpr size_t operator"" _KiB(unsigned long long val) { return val * KiB; }
+constexpr size_t operator"" _MiB(unsigned long long val) { return val * MiB; }
+constexpr size_t operator"" _GiB(unsigned long long val) { return val * GiB; }
--- a/base/common/wide_integer_impl.h
+++ b/base/common/wide_integer_impl.h
@ -9,6 +9,7 @@
 #include <cmath>
 #include <cfloat>
 #include <cassert>
+#include <tuple>
 #include <limits>


@ -39,6 +40,18 @@ static constexpr bool IntegralConcept() noexcept
    return std::is_integral_v<T> || IsWideInteger<T>::value;
 }

+template <typename T>
+class IsTupleLike
+{
+    template <typename U>
+    static auto check(U * p) -> decltype(std::tuple_size<U>::value, int());
+    template <typename>
+    static void check(...);
+
+public:
+    static constexpr const bool value = !std::is_void<decltype(check<T>(nullptr))>::value;
+};
+
 }

 namespace std
@ -227,6 +240,19 @@ struct integer<Bits, Signed>::_impl
            self.items[i] = 0;
    }

+    template <typename TupleLike, size_t i = 0>
+    constexpr static void wide_integer_from_tuple_like(integer<Bits, Signed> & self, const TupleLike & tuple) noexcept
+    {
+        if constexpr (i < item_count)
+        {
+            if constexpr (i < std::tuple_size_v<TupleLike>)
+                self.items[i] = std::get<i>(tuple);
+            else
+                self.items[i] = 0;
+            wide_integer_from_tuple_like<TupleLike, i + 1>(self, tuple);
+        }
+    }
+
    /**
     * N.B. t is constructed from double, so max(t) = max(double) ~ 2^310
     * the recursive call happens when t / 2^64 > 2^64, so there won't be more than 5 of them.
@ -966,6 +992,8 @@ constexpr integer<Bits, Signed>::integer(T rhs) noexcept
 {
    if constexpr (IsWideInteger<T>::value)
        _impl::wide_integer_from_wide_integer(*this, rhs);
+    else if  constexpr (IsTupleLike<T>::value)
+        _impl::wide_integer_from_tuple_like(*this, rhs);
    else
        _impl::wide_integer_from_builtin(*this, rhs);
 }
@ -979,6 +1007,8 @@ constexpr integer<Bits, Signed>::integer(std::initializer_list<T> il) noexcept
    {
        if constexpr (IsWideInteger<T>::value)
            _impl::wide_integer_from_wide_integer(*this, *il.begin());
+        else if  constexpr (IsTupleLike<T>::value)
+            _impl::wide_integer_from_tuple_like(*this, *il.begin());
        else
            _impl::wide_integer_from_builtin(*this, *il.begin());
    }
@ -1007,7 +1037,10 @@ template <size_t Bits, typename Signed>
 template <typename T>
 constexpr integer<Bits, Signed> & integer<Bits, Signed>::operator=(T rhs) noexcept
 {
-    _impl::wide_integer_from_builtin(*this, rhs);
+    if  constexpr (IsTupleLike<T>::value)
+        _impl::wide_integer_from_tuple_like(*this, rhs);
+    else
+        _impl::wide_integer_from_builtin(*this, rhs);
    return *this;
 }

--- a/docker/builder/Dockerfile
+++ b/docker/builder/Dockerfile
@ -2,6 +2,8 @@ FROM ubuntu:20.04

 ENV DEBIAN_FRONTEND=noninteractive LLVM_VERSION=11

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && apt-get install ca-certificates lsb-release wget gnupg apt-transport-https \
        --yes --no-install-recommends --verbose-versions \
--- a/docker/client/Dockerfile
+++ b/docker/client/Dockerfile
@ -3,6 +3,8 @@ FROM ubuntu:18.04
 ARG repository="deb https://repo.clickhouse.tech/deb/stable/ main/"
 ARG version=21.10.1.*

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && apt-get install --yes --no-install-recommends \
        apt-transport-https \
--- a/docker/packager/binary/Dockerfile
+++ b/docker/packager/binary/Dockerfile
@ -3,6 +3,8 @@ FROM ubuntu:20.04

 ENV DEBIAN_FRONTEND=noninteractive LLVM_VERSION=11

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && apt-get install \
        apt-transport-https \
--- a/docker/packager/deb/Dockerfile
+++ b/docker/packager/deb/Dockerfile
@ -3,6 +3,8 @@ FROM ubuntu:20.04

 ENV DEBIAN_FRONTEND=noninteractive LLVM_VERSION=11

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && apt-get install ca-certificates lsb-release wget gnupg apt-transport-https \
        --yes --no-install-recommends --verbose-versions \
--- a/docker/packager/unbundled/Dockerfile
+++ b/docker/packager/unbundled/Dockerfile
@ -5,6 +5,8 @@ RUN export CODENAME="$(lsb_release --codename --short | tr 'A-Z' 'a-z')" \
    && wget -nv -O /tmp/arrow-keyring.deb "https://apache.jfrog.io/artifactory/arrow/ubuntu/apache-arrow-apt-source-latest-${CODENAME}.deb" \
    && dpkg -i /tmp/arrow-keyring.deb

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 # Libraries from OS are only needed to test the "unbundled" build (that is not used in production).
 RUN apt-get update \
    && apt-get install \
--- a/docker/server/Dockerfile
+++ b/docker/server/Dockerfile
@ -26,6 +26,8 @@ ARG DEBIAN_FRONTEND=noninteractive
 # installed to prevent picking those uid / gid by some unrelated software.
 # The same uid / gid (101) is used both for alpine and ubuntu.

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN groupadd -r clickhouse --gid=101 \
    && useradd -r -g clickhouse --uid=101 --home-dir=/var/lib/clickhouse --shell=/bin/bash clickhouse \
    && apt-get update \
--- a/docker/test/base/Dockerfile
+++ b/docker/test/base/Dockerfile
@ -3,6 +3,8 @@ FROM ubuntu:20.04

 ENV DEBIAN_FRONTEND=noninteractive LLVM_VERSION=11

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && apt-get install ca-certificates lsb-release wget gnupg apt-transport-https \
        --yes --no-install-recommends --verbose-versions \
--- a/docker/test/codebrowser/Dockerfile
+++ b/docker/test/codebrowser/Dockerfile
@ -2,6 +2,8 @@
 # docker run --volume=path_to_repo:/repo_folder --volume=path_to_result:/test_output yandex/clickhouse-codebrowser
 FROM yandex/clickhouse-binary-builder

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update && apt-get --yes --allow-unauthenticated install clang-9 libllvm9 libclang-9-dev

 # repo versions doesn't work correctly with C++17
--- a/docker/test/fasttest/Dockerfile
+++ b/docker/test/fasttest/Dockerfile
@ -3,6 +3,8 @@ FROM ubuntu:20.04

 ENV DEBIAN_FRONTEND=noninteractive LLVM_VERSION=11

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && apt-get install ca-certificates lsb-release wget gnupg apt-transport-https \
        --yes --no-install-recommends --verbose-versions \
--- a/docker/test/fuzzer/Dockerfile
+++ b/docker/test/fuzzer/Dockerfile
@ -5,6 +5,8 @@ ENV LANG=C.UTF-8
 ENV TZ=Europe/Moscow
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get install --yes --no-install-recommends \
            ca-certificates \
--- a/docker/test/integration/runner/Dockerfile
+++ b/docker/test/integration/runner/Dockerfile
@ -1,6 +1,8 @@
 # docker build -t yandex/clickhouse-integration-tests-runner .
 FROM ubuntu:20.04

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && env DEBIAN_FRONTEND=noninteractive apt-get install --yes \
    ca-certificates \
--- a/docker/test/performance-comparison/Dockerfile
+++ b/docker/test/performance-comparison/Dockerfile
@ -5,6 +5,8 @@ ENV LANG=C.UTF-8
 ENV TZ=Europe/Moscow
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get install --yes --no-install-recommends \
            bash \
--- a/docker/test/sqlancer/Dockerfile
+++ b/docker/test/sqlancer/Dockerfile
@ -1,6 +1,8 @@
 # docker build -t yandex/clickhouse-sqlancer-test .
 FROM ubuntu:20.04

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update --yes && env DEBIAN_FRONTEND=noninteractive apt-get install wget unzip git openjdk-14-jdk maven python3 --yes --no-install-recommends
 RUN wget https://github.com/sqlancer/sqlancer/archive/master.zip -O /sqlancer.zip
 RUN mkdir /sqlancer && \
--- a/docker/test/style/Dockerfile
+++ b/docker/test/style/Dockerfile
@ -1,6 +1,8 @@
 # docker build -t yandex/clickhouse-style-test .
 FROM ubuntu:20.04

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update && env DEBIAN_FRONTEND=noninteractive apt-get install --yes \
    shellcheck \
    libxml2-utils \
--- a/docker/test/testflows/runner/Dockerfile
+++ b/docker/test/testflows/runner/Dockerfile
@ -1,6 +1,8 @@
 # docker build -t yandex/clickhouse-testflows-runner .
 FROM ubuntu:20.04

+RUN sed -i 's|http://archive|http://ru.archive|g' /etc/apt/sources.list
+
 RUN apt-get update \
    && env DEBIAN_FRONTEND=noninteractive apt-get install --yes \
    ca-certificates \
--- a/docs/en/operations/settings/settings.md
+++ b/docs/en/operations/settings/settings.md
@ -2041,10 +2041,25 @@ Default value: 0.

 ## input_format_parallel_parsing {#input-format-parallel-parsing}

-   Type: bool
-   Default value: True
+Enables or disables order-preserving parallel parsing of data formats. Supported only for [TSV](../../interfaces/formats.md#tabseparated), [TKSV](../../interfaces/formats.md#tskv), [CSV](../../interfaces/formats.md#csv) and [JSONEachRow](../../interfaces/formats.md#jsoneachrow) formats.

-Enable order-preserving parallel parsing of data formats. Supported only for TSV, TKSV, CSV, and JSONEachRow formats.
+Possible values:
+
+-   1 — Enabled.
+-   0 — Disabled.
+
+Default value: `0`.
+
+## output_format_parallel_formatting {#output-format-parallel-formatting}
+
+Enables or disables parallel formatting of data formats. Supported only for [TSV](../../interfaces/formats.md#tabseparated), [TKSV](../../interfaces/formats.md#tskv), [CSV](../../interfaces/formats.md#csv) and [JSONEachRow](../../interfaces/formats.md#jsoneachrow) formats.
+
+Possible values:
+
+-   1 — Enabled.
+-   0 — Disabled.
+
+Default value: `0`.

 ## min_chunk_bytes_for_parallel_parsing {#min-chunk-bytes-for-parallel-parsing}

--- a/docs/en/sql-reference/statements/select/join.md
+++ b/docs/en/sql-reference/statements/select/join.md
@ -6,7 +6,7 @@ toc_title: JOIN

 Join produces a new table by combining columns from one or multiple tables by using values common to each. It is a common operation in databases with SQL support, which corresponds to [relational algebra](https://en.wikipedia.org/wiki/Relational_algebra#Joins_and_join-like_operators) join. The special case of one table join is often referred to as “self-join”.

-Syntax:
+**Syntax**

 ``` sql
 SELECT <expr_list>
@ -38,7 +38,7 @@ Additional join types available in ClickHouse:

 ## Settings {#join-settings}

-The default join type can be overriden using [join_default_strictness](../../../operations/settings/settings.md#settings-join_default_strictness) setting.
+The default join type can be overridden using [join_default_strictness](../../../operations/settings/settings.md#settings-join_default_strictness) setting.

 The behavior of ClickHouse server for `ANY JOIN` operations depends on the [any_join_distinct_right_table_keys](../../../operations/settings/settings.md#any_join_distinct_right_table_keys) setting.

@ -52,6 +52,61 @@ The behavior of ClickHouse server for `ANY JOIN` operations depends on the [any_
 - [join_on_disk_max_files_to_merge](../../../operations/settings/settings.md#join_on_disk_max_files_to_merge)
 - [any_join_distinct_right_table_keys](../../../operations/settings/settings.md#any_join_distinct_right_table_keys)

+## ON Section Conditions {on-section-conditions}
+
+An `ON` section can contain several conditions combined using the `AND` operator. Conditions specifying join keys must refer both left and right tables and must use the equality operator. Other conditions may use other logical operators but they must refer either the left or the right table of a query.
+Rows are joined if the whole complex condition is met. If the conditions are not met, still rows may be included in the result depending on the `JOIN` type. Note that if the same conditions are placed in a `WHERE` section and they are not met, then rows are always filtered out from the result.
+
+!!! note "Note"
+    The `OR` operator inside an `ON` section is not supported yet.
+
+!!! note "Note"
+    If a condition refers columns from different tables, then only the equality operator (`=`) is supported so far.
+
+**Example**
+
+Consider `table_1` and `table_2`:
+
+```
+┌─Id─┬─name─┐     ┌─Id─┬─text───────────┬─scores─┐
+│  1 │ A    │     │  1 │ Text A         │     10 │
+│  2 │ B    │     │  1 │ Another text A │     12 │
+│  3 │ C    │     │  2 │ Text B         │     15 │
+└────┴──────┘     └────┴────────────────┴────────┘
+```
+
+Query with one join key condition and an additional condition for `table_2`:
+
+``` sql
+SELECT name, text FROM table_1 LEFT OUTER JOIN table_2 
+    ON table_1.Id = table_2.Id AND startsWith(table_2.text, 'Text');
+```
+
+Note that the result contains the row with the name `C` and the empty text column. It is included into the result because an `OUTER` type of a join is used.
+
+```
+┌─name─┬─text───┐
+│ A    │ Text A │
+│ B    │ Text B │
+│ C    │        │
+└──────┴────────┘
+```
+
+Query with `INNER` type of a join and multiple conditions:
+
+``` sql
+SELECT name, text, scores FROM table_1 INNER JOIN table_2 
+    ON table_1.Id = table_2.Id AND table_2.scores > 10 AND startsWith(table_2.text, 'Text');
+```
+
+Result:
+
+```
+┌─name─┬─text───┬─scores─┐
+│ B    │ Text B │     15 │
+└──────┴────────┴────────┘
+```
+
 ## ASOF JOIN Usage {#asof-join-usage}

 `ASOF JOIN` is useful when you need to join records that have no exact match.
@ -59,7 +114,7 @@ The behavior of ClickHouse server for `ANY JOIN` operations depends on the [any_
 Algorithm requires the special column in tables. This column:

 -   Must contain an ordered sequence.
-   Can be one of the following types: [Int*, UInt*](../../../sql-reference/data-types/int-uint.md), [Float\*](../../../sql-reference/data-types/float.md), [Date](../../../sql-reference/data-types/date.md), [DateTime](../../../sql-reference/data-types/datetime.md), [Decimal\*](../../../sql-reference/data-types/decimal.md).
+-   Can be one of the following types: [Int, UInt](../../../sql-reference/data-types/int-uint.md), [Float](../../../sql-reference/data-types/float.md), [Date](../../../sql-reference/data-types/date.md), [DateTime](../../../sql-reference/data-types/datetime.md), [Decimal](../../../sql-reference/data-types/decimal.md).
 -   Can’t be the only column in the `JOIN` clause.

 Syntax `ASOF JOIN ... ON`:
@ -84,7 +139,7 @@ ASOF JOIN table_2
 USING (equi_column1, ... equi_columnN, asof_column)
 ```

-`ASOF JOIN` uses `equi_columnX` for joining on equality and `asof_column` for joining on the closest match with the `table_1.asof_column >= table_2.asof_column` condition. The `asof_column` column always the last one in the `USING` clause.
+`ASOF JOIN` uses `equi_columnX` for joining on equality and `asof_column` for joining on the closest match with the `table_1.asof_column >= table_2.asof_column` condition. The `asof_column` column is always the last one in the `USING` clause.

 For example, consider the following tables:

--- a/docs/ru/operations/settings/settings.md
+++ b/docs/ru/operations/settings/settings.md
@ -1865,10 +1865,25 @@ ClickHouse генерирует исключение

 ## input_format_parallel_parsing {#input-format-parallel-parsing}

-   Тип: bool
-   Значение по умолчанию: True
+Включает или отключает режим, при котором входящие данные разбиваются на части, парсинг каждой из которых осуществляется параллельно с сохранением исходного порядка. Поддерживается только для форматов [TSV](../../interfaces/formats.md#tabseparated), [TKSV](../../interfaces/formats.md#tskv), [CSV](../../interfaces/formats.md#csv) и [JSONEachRow](../../interfaces/formats.md#jsoneachrow).

-Включает режим, при котором входящие данные парсятся параллельно, но с сохранением исходного порядка следования. Поддерживается только для форматов TSV, TKSV, CSV и JSONEachRow.
+Возможные значения:
+
+-   1 — включен режим параллельного разбора.
+-   0 — отключен режим параллельного разбора.
+
+Значение по умолчанию: `0`.
+
+## output_format_parallel_formatting {#output-format-parallel-formatting}
+
+Включает или отключает режим, при котором исходящие данные форматируются параллельно с сохранением исходного порядка. Поддерживается только для форматов [TSV](../../interfaces/formats.md#tabseparated), [TKSV](../../interfaces/formats.md#tskv), [CSV](../../interfaces/formats.md#csv) и [JSONEachRow](../../interfaces/formats.md#jsoneachrow).
+
+Возможные значения:
+
+-   1 — включен режим параллельного форматирования.
+-   0 — отключен режим параллельного форматирования.
+
+Значение по умолчанию: `0`.

 ## min_chunk_bytes_for_parallel_parsing {#min-chunk-bytes-for-parallel-parsing}

--- a/docs/ru/sql-reference/statements/select/join.md
+++ b/docs/ru/sql-reference/statements/select/join.md
@ -6,7 +6,7 @@ toc_title: JOIN

 `JOIN` создаёт новую таблицу путем объединения столбцов из одной или нескольких таблиц с использованием общих для каждой из них значений. Это обычная операция в базах данных с поддержкой SQL, которая соответствует join из [реляционной алгебры](https://en.wikipedia.org/wiki/Relational_algebra#Joins_and_join-like_operators). Частный случай соединения одной таблицы часто называют self-join.

-Синтаксис:
+**Синтаксис**

 ``` sql
 SELECT <expr_list>
@ -19,7 +19,7 @@ FROM <left_table>

 ## Поддерживаемые типы соединения {#select-join-types}

-Все типы из стандартого [SQL JOIN](https://en.wikipedia.org/wiki/Join_(SQL)) поддерживаются:
+Все типы из стандартного [SQL JOIN](https://en.wikipedia.org/wiki/Join_(SQL)) поддерживаются:

 -   `INNER JOIN`, возвращаются только совпадающие строки.
 -   `LEFT OUTER JOIN`, не совпадающие строки из левой таблицы возвращаются в дополнение к совпадающим строкам.
@ -33,7 +33,7 @@ FROM <left_table>

 -   `LEFT SEMI JOIN` и `RIGHT SEMI JOIN`, белый список по ключам соединения, не производит декартово произведение.
 -   `LEFT ANTI JOIN` и `RIGHT ANTI JOIN`, черный список по ключам соединения, не производит декартово произведение.
-   `LEFT ANY JOIN`, `RIGHT ANY JOIN` и `INNER ANY JOIN`, Частично (для противоположных сторон `LEFT` и `RIGHT`) или полностью (для `INNER` и `FULL`) отключает декартово произведение для стандартых видов `JOIN`.
+-   `LEFT ANY JOIN`, `RIGHT ANY JOIN` и `INNER ANY JOIN`, Частично (для противоположных сторон `LEFT` и `RIGHT`) или полностью (для `INNER` и `FULL`) отключает декартово произведение для стандартных видов `JOIN`.
 -   `ASOF JOIN` и `LEFT ASOF JOIN`, Для соединения последовательностей по нечеткому совпадению. Использование `ASOF JOIN` описано ниже.

 ## Настройки {#join-settings}
@ -52,6 +52,61 @@ FROM <left_table>
 - [join_on_disk_max_files_to_merge](../../../operations/settings/settings.md#join_on_disk_max_files_to_merge)
 - [any_join_distinct_right_table_keys](../../../operations/settings/settings.md#any_join_distinct_right_table_keys)

+## Условия в секции ON {on-section-conditions}
+
+Секция `ON` может содержать несколько условий, связанных оператором `AND`. Условия, задающие ключи соединения, должны содержать столбцы левой и правой таблицы и должны использовать оператор равенства. Прочие условия могут использовать другие логические операторы, но в отдельном условии могут использоваться столбцы либо только левой, либо только правой таблицы.
+Строки объединяются только тогда, когда всё составное условие выполнено. Если оно не выполнено, то строки могут попасть в результат в зависимости от типа `JOIN`. Обратите внимание, что если то же самое условие поместить в секцию `WHERE`, то строки, для которых оно не выполняется, никогда не попаду в результат.
+
+!!! note "Примечание"
+    Оператор `OR` внутри секции `ON` пока не поддерживается.
+
+!!! note "Примечание"
+    Если в условии использованы столбцы из разных таблиц, то пока поддерживается только оператор равенства (`=`).
+
+**Пример**
+
+Рассмотрим `table_1` и `table_2`:
+
+```
+┌─Id─┬─name─┐     ┌─Id─┬─text───────────┬─scores─┐
+│  1 │ A    │     │  1 │ Text A         │     10 │
+│  2 │ B    │     │  1 │ Another text A │     12 │
+│  3 │ C    │     │  2 │ Text B         │     15 │
+└────┴──────┘     └────┴────────────────┴────────┘
+```
+
+Запрос с одним условием, задающим ключ соединения, и дополнительным условием для `table_2`:
+
+``` sql
+SELECT name, text FROM table_1 LEFT OUTER JOIN table_2 
+    ON table_1.Id = table_2.Id AND startsWith(table_2.text, 'Text');
+```
+
+Обратите внимание, что результат содержит строку с именем `C` и пустым текстом. Строка включена в результат, потому что использован тип соединения `OUTER`.
+
+```
+┌─name─┬─text───┐
+│ A    │ Text A │
+│ B    │ Text B │
+│ C    │        │
+└──────┴────────┘
+```
+
+Запрос с типом соединения `INNER` и несколькими условиями:
+
+``` sql
+SELECT name, text, scores FROM table_1 INNER JOIN table_2 
+    ON table_1.Id = table_2.Id AND table_2.scores > 10 AND startsWith(table_2.text, 'Text');
+```
+
+Результат:
+
+```
+┌─name─┬─text───┬─scores─┐
+│ B    │ Text B │     15 │
+└──────┴────────┴────────┘
+```
+
 ## Использование ASOF JOIN {#asof-join-usage}

 `ASOF JOIN` применим в том случае, когда необходимо объединять записи, которые не имеют точного совпадения.
@ -59,7 +114,7 @@ FROM <left_table>
 Для работы алгоритма необходим специальный столбец в таблицах. Этот столбец:

 - Должен содержать упорядоченную последовательность.
- Может быть одного из следующих типов: [Int*, UInt*](../../data-types/int-uint.md), [Float*](../../data-types/float.md), [Date](../../data-types/date.md), [DateTime](../../data-types/datetime.md), [Decimal*](../../data-types/decimal.md).
+- Может быть одного из следующих типов: [Int, UInt](../../data-types/int-uint.md), [Float](../../data-types/float.md), [Date](../../data-types/date.md), [DateTime](../../data-types/datetime.md), [Decimal](../../data-types/decimal.md).
 - Не может быть единственным столбцом в секции `JOIN`.

 Синтаксис `ASOF JOIN ... ON`:
--- a/programs/local/LocalServer.cpp
+++ b/programs/local/LocalServer.cpp
@ -376,8 +376,8 @@ void LocalServer::processQueries()
        throw Exception("Cannot parse and execute the following part of query: " + String(parse_res.first), ErrorCodes::SYNTAX_ERROR);

    /// Authenticate and create a context to execute queries.
-    Session session{global_context, ClientInfo::Interface::TCP};
-    session.authenticate("default", "", Poco::Net::SocketAddress{});
+    Session session{global_context, ClientInfo::Interface::LOCAL};
+    session.authenticate("default", "", {});

    /// Use the same context for all queries.
    auto context = session.makeQueryContext();
--- a/programs/server/Server.cpp
+++ b/programs/server/Server.cpp
@ -736,6 +736,10 @@ if (ThreadFuzzer::instance().isEffective())
            setupTmpPath(log, disk->getPath());
    }

+    /// Storage keeping all the backups.
+    fs::create_directories(path / "backups");
+    global_context->setBackupsVolume(config().getString("backups_path", path / "backups"), config().getString("backups_policy", ""));
+
    /** Directory with 'flags': files indicating temporary settings for the server set by system administrator.
      * Flags may be cleared automatically after being applied by the server.
      * Examples: do repair of local data; clone all replicated tables from replica.
--- a/src/AggregateFunctions/AggregateFunctionQuantile.cpp
+++ b/src/AggregateFunctions/AggregateFunctionQuantile.cpp
@ -56,6 +56,8 @@ template <typename Value, bool float_return> using FuncQuantilesTDigestWeighted
 template <typename Value, bool float_return> using FuncQuantileBFloat16 = AggregateFunctionQuantile<Value, QuantileBFloat16Histogram<Value>, NameQuantileBFloat16, false, std::conditional_t<float_return, Float64, void>, false>;
 template <typename Value, bool float_return> using FuncQuantilesBFloat16 = AggregateFunctionQuantile<Value, QuantileBFloat16Histogram<Value>, NameQuantilesBFloat16, false, std::conditional_t<float_return, Float64, void>, true>;

+template <typename Value, bool float_return> using FuncQuantileBFloat16Weighted = AggregateFunctionQuantile<Value, QuantileBFloat16Histogram<Value>, NameQuantileBFloat16Weighted, true, std::conditional_t<float_return, Float64, void>, false>;
+template <typename Value, bool float_return> using FuncQuantilesBFloat16Weighted = AggregateFunctionQuantile<Value, QuantileBFloat16Histogram<Value>, NameQuantilesBFloat16Weighted, true, std::conditional_t<float_return, Float64, void>, true>;

 template <template <typename, bool> class Function>
 static constexpr bool supportDecimal()
@ -167,6 +169,9 @@ void registerAggregateFunctionsQuantile(AggregateFunctionFactory & factory)
    factory.registerFunction(NameQuantileBFloat16::name, createAggregateFunctionQuantile<FuncQuantileBFloat16>);
    factory.registerFunction(NameQuantilesBFloat16::name, { createAggregateFunctionQuantile<FuncQuantilesBFloat16>, properties });

+    factory.registerFunction(NameQuantileBFloat16Weighted::name, createAggregateFunctionQuantile<FuncQuantileBFloat16Weighted>);
+    factory.registerFunction(NameQuantilesBFloat16Weighted::name, createAggregateFunctionQuantile<FuncQuantilesBFloat16Weighted>);
+
    /// 'median' is an alias for 'quantile'
    factory.registerAlias("median", NameQuantile::name);
    factory.registerAlias("medianDeterministic", NameQuantileDeterministic::name);
@ -179,6 +184,7 @@ void registerAggregateFunctionsQuantile(AggregateFunctionFactory & factory)
    factory.registerAlias("medianTDigest", NameQuantileTDigest::name);
    factory.registerAlias("medianTDigestWeighted", NameQuantileTDigestWeighted::name);
    factory.registerAlias("medianBFloat16", NameQuantileBFloat16::name);
+    factory.registerAlias("medianBFloat16Weighted", NameQuantileBFloat16Weighted::name);
 }

 }
--- a/src/AggregateFunctions/AggregateFunctionQuantile.h
+++ b/src/AggregateFunctions/AggregateFunctionQuantile.h
@ -237,5 +237,7 @@ struct NameQuantilesTDigestWeighted { static constexpr auto name = "quantilesTDi

 struct NameQuantileBFloat16 { static constexpr auto name = "quantileBFloat16"; };
 struct NameQuantilesBFloat16 { static constexpr auto name = "quantilesBFloat16"; };
+struct NameQuantileBFloat16Weighted { static constexpr auto name = "quantileBFloat16Weighted"; };
+struct NameQuantilesBFloat16Weighted { static constexpr auto name = "quantilesBFloat16Weighted"; };

 }
--- a/src/Backups/BackupEntryConcat.cpp
+++ b/src/Backups/BackupEntryConcat.cpp
@ -0,0 +1,28 @@
+#include <Backups/BackupEntryConcat.h>
+#include <IO/ConcatReadBuffer.h>
+
+
+namespace DB
+{
+BackupEntryConcat::BackupEntryConcat(
+    BackupEntryPtr first_source_,
+    BackupEntryPtr second_source_,
+    const std::optional<UInt128> & checksum_)
+    : first_source(std::move(first_source_))
+    , second_source(std::move(second_source_))
+    , checksum(checksum_)
+{
+}
+
+UInt64 BackupEntryConcat::getSize() const
+{
+    if (!size)
+        size = first_source->getSize() + second_source->getSize();
+    return *size;
+}
+
+std::unique_ptr<ReadBuffer> BackupEntryConcat::getReadBuffer() const
+{
+    return std::make_unique<ConcatReadBuffer>(first_source->getReadBuffer(), second_source->getReadBuffer());
+}
+}
--- a/src/Backups/BackupEntryConcat.h
+++ b/src/Backups/BackupEntryConcat.h
@ -0,0 +1,30 @@
+#pragma once
+
+#include <Backups/IBackupEntry.h>
+
+
+namespace DB
+{
+
+/// Concatenates data of two backup entries.
+class BackupEntryConcat : public IBackupEntry
+{
+public:
+    /// The constructor is allowed to not set `checksum_`, in that case it will be calculated from the data.
+    BackupEntryConcat(
+        BackupEntryPtr first_source_,
+        BackupEntryPtr second_source_,
+        const std::optional<UInt128> & checksum_ = {});
+
+    UInt64 getSize() const override;
+    std::optional<UInt128> getChecksum() const override { return checksum; }
+    std::unique_ptr<ReadBuffer> getReadBuffer() const override;
+
+private:
+    BackupEntryPtr first_source;
+    BackupEntryPtr second_source;
+    mutable std::optional<UInt64> size;
+    std::optional<UInt128> checksum;
+};
+
+}
--- a/src/Backups/BackupEntryFromAppendOnlyFile.cpp
+++ b/src/Backups/BackupEntryFromAppendOnlyFile.cpp
@ -0,0 +1,35 @@
+#include <Backups/BackupEntryFromAppendOnlyFile.h>
+#include <IO/LimitReadBuffer.h>
+
+
+namespace DB
+{
+
+BackupEntryFromAppendOnlyFile::BackupEntryFromAppendOnlyFile(
+    const String & file_path_,
+    const std::optional<UInt64> & file_size_,
+    const std::optional<UInt128> & checksum_,
+    const std::shared_ptr<Poco::TemporaryFile> & temporary_file_)
+    : BackupEntryFromImmutableFile(file_path_, file_size_, checksum_, temporary_file_)
+    , limit(BackupEntryFromImmutableFile::getSize())
+{
+}
+
+BackupEntryFromAppendOnlyFile::BackupEntryFromAppendOnlyFile(
+    const DiskPtr & disk_,
+    const String & file_path_,
+    const std::optional<UInt64> & file_size_,
+    const std::optional<UInt128> & checksum_,
+    const std::shared_ptr<TemporaryFileOnDisk> & temporary_file_)
+    : BackupEntryFromImmutableFile(disk_, file_path_, file_size_, checksum_, temporary_file_)
+    , limit(BackupEntryFromImmutableFile::getSize())
+{
+}
+
+std::unique_ptr<ReadBuffer> BackupEntryFromAppendOnlyFile::getReadBuffer() const
+{
+    auto buf = BackupEntryFromImmutableFile::getReadBuffer();
+    return std::make_unique<LimitReadBuffer>(std::move(buf), limit, true);
+}
+
+}
--- a/src/Backups/BackupEntryFromAppendOnlyFile.h
+++ b/src/Backups/BackupEntryFromAppendOnlyFile.h
@ -0,0 +1,35 @@
+#pragma once
+
+#include <Backups/BackupEntryFromImmutableFile.h>
+
+
+namespace DB
+{
+
+/// Represents a file prepared to be included in a backup, assuming that until this backup entry is destroyed
+/// the file can be appended with new data, but the bytes which are already in the file won't be changed.
+class BackupEntryFromAppendOnlyFile : public BackupEntryFromImmutableFile
+{
+public:
+    /// The constructor is allowed to not set `file_size_` or `checksum_`, in that case it will be calculated from the data.
+    BackupEntryFromAppendOnlyFile(
+        const String & file_path_,
+        const std::optional<UInt64> & file_size_ = {},
+        const std::optional<UInt128> & checksum_ = {},
+        const std::shared_ptr<Poco::TemporaryFile> & temporary_file_ = {});
+
+    BackupEntryFromAppendOnlyFile(
+        const DiskPtr & disk_,
+        const String & file_path_,
+        const std::optional<UInt64> & file_size_ = {},
+        const std::optional<UInt128> & checksum_ = {},
+        const std::shared_ptr<TemporaryFileOnDisk> & temporary_file_ = {});
+
+    UInt64 getSize() const override { return limit; }
+    std::unique_ptr<ReadBuffer> getReadBuffer() const override;
+
+private:
+    const UInt64 limit;
+};
+
+}
--- a/src/Backups/BackupEntryFromImmutableFile.cpp
+++ b/src/Backups/BackupEntryFromImmutableFile.cpp
@ -0,0 +1,47 @@
+#include <Backups/BackupEntryFromImmutableFile.h>
+#include <Disks/IDisk.h>
+#include <IO/createReadBufferFromFileBase.h>
+#include <Poco/File.h>
+
+
+namespace DB
+{
+
+BackupEntryFromImmutableFile::BackupEntryFromImmutableFile(
+    const String & file_path_,
+    const std::optional<UInt64> & file_size_,
+    const std::optional<UInt128> & checksum_,
+    const std::shared_ptr<Poco::TemporaryFile> & temporary_file_)
+    : file_path(file_path_), file_size(file_size_), checksum(checksum_), temporary_file(temporary_file_)
+{
+}
+
+BackupEntryFromImmutableFile::BackupEntryFromImmutableFile(
+    const DiskPtr & disk_,
+    const String & file_path_,
+    const std::optional<UInt64> & file_size_,
+    const std::optional<UInt128> & checksum_,
+    const std::shared_ptr<TemporaryFileOnDisk> & temporary_file_)
+    : disk(disk_), file_path(file_path_), file_size(file_size_), checksum(checksum_), temporary_file_on_disk(temporary_file_)
+{
+}
+
+BackupEntryFromImmutableFile::~BackupEntryFromImmutableFile() = default;
+
+UInt64 BackupEntryFromImmutableFile::getSize() const
+{
+    std::lock_guard lock{get_file_size_mutex};
+    if (!file_size)
+        file_size = disk ? disk->getFileSize(file_path) : Poco::File(file_path).getSize();
+    return *file_size;
+}
+
+std::unique_ptr<ReadBuffer> BackupEntryFromImmutableFile::getReadBuffer() const
+{
+    if (disk)
+        return disk->readFile(file_path);
+    else
+        return createReadBufferFromFileBase(file_path, 0, 0, 0, nullptr);
+}
+
+}
--- a/src/Backups/BackupEntryFromImmutableFile.h
+++ b/src/Backups/BackupEntryFromImmutableFile.h
@ -0,0 +1,51 @@
+#pragma once
+
+#include <Backups/IBackupEntry.h>
+#include <mutex>
+
+namespace Poco { class TemporaryFile; }
+
+namespace DB
+{
+class TemporaryFileOnDisk;
+class IDisk;
+using DiskPtr = std::shared_ptr<IDisk>;
+
+/// Represents a file prepared to be included in a backup, assuming that until this backup entry is destroyed the file won't be changed.
+class BackupEntryFromImmutableFile : public IBackupEntry
+{
+public:
+    /// The constructor is allowed to not set `file_size_` or `checksum_`, in that case it will be calculated from the data.
+    BackupEntryFromImmutableFile(
+        const String & file_path_,
+        const std::optional<UInt64> & file_size_ = {},
+        const std::optional<UInt128> & checksum_ = {},
+        const std::shared_ptr<Poco::TemporaryFile> & temporary_file_ = {});
+
+    BackupEntryFromImmutableFile(
+        const DiskPtr & disk_,
+        const String & file_path_,
+        const std::optional<UInt64> & file_size_ = {},
+        const std::optional<UInt128> & checksum_ = {},
+        const std::shared_ptr<TemporaryFileOnDisk> & temporary_file_ = {});
+
+    ~BackupEntryFromImmutableFile() override;
+
+    UInt64 getSize() const override;
+    std::optional<UInt128> getChecksum() const override { return checksum; }
+    std::unique_ptr<ReadBuffer> getReadBuffer() const override;
+
+    String getFilePath() const { return file_path; }
+    DiskPtr getDisk() const { return disk; }
+
+private:
+    const DiskPtr disk;
+    const String file_path;
+    mutable std::optional<UInt64> file_size;
+    mutable std::mutex get_file_size_mutex;
+    const std::optional<UInt128> checksum;
+    const std::shared_ptr<Poco::TemporaryFile> temporary_file;
+    const std::shared_ptr<TemporaryFileOnDisk> temporary_file_on_disk;
+};
+
+}
--- a/src/Backups/BackupEntryFromMemory.cpp
+++ b/src/Backups/BackupEntryFromMemory.cpp
@ -0,0 +1,23 @@
+#include <Backups/BackupEntryFromMemory.h>
+#include <IO/ReadBufferFromString.h>
+
+
+namespace DB
+{
+
+BackupEntryFromMemory::BackupEntryFromMemory(const void * data_, size_t size_, const std::optional<UInt128> & checksum_)
+    : BackupEntryFromMemory(String{reinterpret_cast<const char *>(data_), size_}, checksum_)
+{
+}
+
+BackupEntryFromMemory::BackupEntryFromMemory(String data_, const std::optional<UInt128> & checksum_)
+    : data(std::move(data_)), checksum(checksum_)
+{
+}
+
+std::unique_ptr<ReadBuffer> BackupEntryFromMemory::getReadBuffer() const
+{
+    return std::make_unique<ReadBufferFromString>(data);
+}
+
+}
--- a/src/Backups/BackupEntryFromMemory.h
+++ b/src/Backups/BackupEntryFromMemory.h
@ -0,0 +1,27 @@
+#pragma once
+
+#include <Backups/IBackupEntry.h>
+#include <IO/ReadBufferFromString.h>
+
+
+namespace DB
+{
+
+/// Represents small preloaded data to be included in a backup.
+class BackupEntryFromMemory : public IBackupEntry
+{
+public:
+    /// The constructor is allowed to not set `checksum_`, in that case it will be calculated from the data.
+    BackupEntryFromMemory(const void * data_, size_t size_, const std::optional<UInt128> & checksum_ = {});
+    BackupEntryFromMemory(String data_, const std::optional<UInt128> & checksum_ = {});
+
+    UInt64 getSize() const override { return data.size(); }
+    std::optional<UInt128> getChecksum() const override { return checksum; }
+    std::unique_ptr<ReadBuffer> getReadBuffer() const override;
+
+private:
+    const String data;
+    const std::optional<UInt128> checksum;
+};
+
+}
--- a/src/Backups/BackupEntryFromSmallFile.cpp
+++ b/src/Backups/BackupEntryFromSmallFile.cpp
@ -0,0 +1,39 @@
+#include <Backups/BackupEntryFromSmallFile.h>
+#include <Disks/IDisk.h>
+#include <IO/createReadBufferFromFileBase.h>
+#include <IO/ReadHelpers.h>
+
+
+namespace DB
+{
+namespace
+{
+    String readFile(const String & file_path)
+    {
+        auto buf = createReadBufferFromFileBase(file_path, 0, 0, 0, nullptr);
+        String s;
+        readStringUntilEOF(s, *buf);
+        return s;
+    }
+
+    String readFile(const DiskPtr & disk, const String & file_path)
+    {
+        auto buf = disk->readFile(file_path);
+        String s;
+        readStringUntilEOF(s, *buf);
+        return s;
+    }
+}
+
+
+BackupEntryFromSmallFile::BackupEntryFromSmallFile(const String & file_path_, const std::optional<UInt128> & checksum_)
+    : BackupEntryFromMemory(readFile(file_path_), checksum_), file_path(file_path_)
+{
+}
+
+BackupEntryFromSmallFile::BackupEntryFromSmallFile(
+    const DiskPtr & disk_, const String & file_path_, const std::optional<UInt128> & checksum_)
+    : BackupEntryFromMemory(readFile(disk_, file_path_), checksum_), disk(disk_), file_path(file_path_)
+{
+}
+}
--- a/src/Backups/BackupEntryFromSmallFile.h
+++ b/src/Backups/BackupEntryFromSmallFile.h
@ -0,0 +1,34 @@
+#pragma once
+
+#include <Backups/BackupEntryFromMemory.h>
+
+
+namespace DB
+{
+class IDisk;
+using DiskPtr = std::shared_ptr<IDisk>;
+
+/// Represents a file prepared to be included in a backup,
+/// assuming that the file is small and can be easily loaded into memory.
+class BackupEntryFromSmallFile : public BackupEntryFromMemory
+{
+public:
+    /// The constructor is allowed to not set `checksum_`, in that case it will be calculated from the data.
+    BackupEntryFromSmallFile(
+        const String & file_path_,
+        const std::optional<UInt128> & checksum_ = {});
+
+    BackupEntryFromSmallFile(
+        const DiskPtr & disk_,
+        const String & file_path_,
+        const std::optional<UInt128> & checksum_ = {});
+
+    String getFilePath() const { return file_path; }
+    DiskPtr getDisk() const { return disk; }
+
+private:
+    const DiskPtr disk;
+    const String file_path;
+};
+
+}
--- a/src/Backups/BackupFactory.cpp
+++ b/src/Backups/BackupFactory.cpp
@ -0,0 +1,65 @@
+#include <Backups/BackupFactory.h>
+#include <Backups/BackupInDirectory.h>
+#include <Interpreters/Context.h>
+#include <Disks/IVolume.h>
+
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int BACKUP_NOT_FOUND;
+    extern const int BACKUP_ALREADY_EXISTS;
+    extern const int NOT_ENOUGH_SPACE;
+    extern const int LOGICAL_ERROR;
+}
+
+
+BackupFactory & BackupFactory::instance()
+{
+    static BackupFactory the_instance;
+    return the_instance;
+}
+
+void BackupFactory::setBackupsVolume(VolumePtr backups_volume_)
+{
+    backups_volume = backups_volume_;
+}
+
+BackupMutablePtr BackupFactory::createBackup(const String & backup_name, UInt64 estimated_backup_size, const BackupPtr & base_backup) const
+{
+    if (!backups_volume)
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "No backups volume");
+
+    for (const auto & disk : backups_volume->getDisks())
+    {
+        if (disk->exists(backup_name))
+            throw Exception(ErrorCodes::BACKUP_ALREADY_EXISTS, "Backup {} already exists", quoteString(backup_name));
+    }
+
+    auto reservation = backups_volume->reserve(estimated_backup_size);
+    if (!reservation)
+        throw Exception(
+            ErrorCodes::NOT_ENOUGH_SPACE,
+            "Couldn't reserve {} bytes of free space for new backup {}",
+            estimated_backup_size,
+            quoteString(backup_name));
+
+    return std::make_shared<BackupInDirectory>(IBackup::OpenMode::WRITE, reservation->getDisk(), backup_name, base_backup);
+}
+
+BackupPtr BackupFactory::openBackup(const String & backup_name, const BackupPtr & base_backup) const
+{
+    if (!backups_volume)
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "No backups volume");
+
+    for (const auto & disk : backups_volume->getDisks())
+    {
+        if (disk->exists(backup_name))
+            return std::make_shared<BackupInDirectory>(IBackup::OpenMode::READ, disk, backup_name, base_backup);
+    }
+
+    throw Exception(ErrorCodes::BACKUP_NOT_FOUND, "Backup {} not found", quoteString(backup_name));
+}
+
+}
--- a/src/Backups/BackupFactory.h
+++ b/src/Backups/BackupFactory.h
@ -0,0 +1,38 @@
+#pragma once
+
+#include <Core/Types.h>
+#include <boost/noncopyable.hpp>
+#include <memory>
+
+
+namespace DB
+{
+class IBackup;
+using BackupPtr = std::shared_ptr<const IBackup>;
+using BackupMutablePtr = std::shared_ptr<IBackup>;
+class Context;
+using ContextMutablePtr = std::shared_ptr<Context>;
+class IVolume;
+using VolumePtr = std::shared_ptr<IVolume>;
+
+
+/// Factory for implementations of the IBackup interface.
+class BackupFactory : boost::noncopyable
+{
+public:
+    static BackupFactory & instance();
+
+    /// Must be called to initialize the backup factory.
+    void setBackupsVolume(VolumePtr backups_volume_);
+
+    /// Creates a new backup and open it for writing.
+    BackupMutablePtr createBackup(const String & backup_name, UInt64 estimated_backup_size, const BackupPtr & base_backup = {}) const;
+
+    /// Opens an existing backup for reading.
+    BackupPtr openBackup(const String & backup_name, const BackupPtr & base_backup = {}) const;
+
+private:
+    VolumePtr backups_volume;
+};
+
+}
--- a/src/Backups/BackupInDirectory.cpp
+++ b/src/Backups/BackupInDirectory.cpp
@ -0,0 +1,454 @@
+#include <Backups/BackupInDirectory.h>
+#include <Backups/BackupFactory.h>
+#include <Backups/BackupEntryConcat.h>
+#include <Backups/BackupEntryFromImmutableFile.h>
+#include <Backups/BackupEntryFromMemory.h>
+#include <Backups/IBackupEntry.h>
+#include <Common/StringUtils/StringUtils.h>
+#include <Common/typeid_cast.h>
+#include <Common/quoteString.h>
+#include <Disks/DiskSelector.h>
+#include <Disks/IDisk.h>
+#include <IO/HashingReadBuffer.h>
+#include <IO/ReadBufferFromFileBase.h>
+#include <IO/ReadHelpers.h>
+#include <IO/SeekableReadBuffer.h>
+#include <IO/WriteBufferFromFileBase.h>
+#include <IO/WriteHelpers.h>
+#include <IO/copyData.h>
+#include <boost/range/adaptor/map.hpp>
+
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int BACKUP_NOT_FOUND;
+    extern const int BACKUP_ALREADY_EXISTS;
+    extern const int BACKUP_VERSION_NOT_SUPPORTED;
+    extern const int BACKUP_DAMAGED;
+    extern const int NO_BASE_BACKUP;
+    extern const int WRONG_BASE_BACKUP;
+    extern const int BACKUP_ENTRY_ALREADY_EXISTS;
+    extern const int BACKUP_ENTRY_NOT_FOUND;
+    extern const int BAD_ARGUMENTS;
+    extern const int LOGICAL_ERROR;
+}
+
+namespace
+{
+    const UInt64 BACKUP_VERSION = 1;
+}
+
+BackupInDirectory::BackupInDirectory(OpenMode open_mode_, const DiskPtr & disk_, const String & path_, const std::shared_ptr<const IBackup> & base_backup_)
+    : open_mode(open_mode_), disk(disk_), path(path_), path_with_sep(path_), base_backup(base_backup_)
+{
+    if (!path_with_sep.ends_with('/'))
+        path_with_sep += '/';
+    trimRight(path, '/');
+    open();
+}
+
+BackupInDirectory::~BackupInDirectory()
+{
+    close();
+}
+
+void BackupInDirectory::open()
+{
+    if (open_mode == OpenMode::WRITE)
+    {
+        if (disk->exists(path))
+            throw Exception(ErrorCodes::BACKUP_ALREADY_EXISTS, "Backup {} already exists", quoteString(path));
+        disk->createDirectories(path);
+        directory_was_created = true;
+        writePathToBaseBackup();
+    }
+
+    if (open_mode == OpenMode::READ)
+    {
+        if (!disk->isDirectory(path))
+            throw Exception(ErrorCodes::BACKUP_NOT_FOUND, "Backup {} not found", quoteString(path));
+        readContents();
+        readPathToBaseBackup();
+    }
+}
+
+void BackupInDirectory::close()
+{
+    if (open_mode == OpenMode::WRITE)
+    {
+        if (!finalized && directory_was_created)
+        {
+            /// Creating of the backup wasn't finished correctly,
+            /// so the backup cannot be used and it's better to remove its files.
+            disk->removeRecursive(path);
+        }
+    }
+}
+
+void BackupInDirectory::writePathToBaseBackup()
+{
+    String file_path = path_with_sep + ".base_backup";
+    if (!base_backup)
+    {
+        disk->removeFileIfExists(file_path);
+        return;
+    }
+    auto out = disk->writeFile(file_path);
+    writeString(base_backup->getPath(), *out);
+}
+
+void BackupInDirectory::readPathToBaseBackup()
+{
+    if (base_backup)
+        return;
+    String file_path = path_with_sep + ".base_backup";
+    if (!disk->exists(file_path))
+        return;
+    auto in = disk->readFile(file_path);
+    String base_backup_path;
+    readStringUntilEOF(base_backup_path, *in);
+    if (base_backup_path.empty())
+        return;
+    base_backup = BackupFactory::instance().openBackup(base_backup_path);
+}
+
+void BackupInDirectory::writeContents()
+{
+    auto out = disk->writeFile(path_with_sep + ".contents");
+    writeVarUInt(BACKUP_VERSION, *out);
+
+    writeVarUInt(infos.size(), *out);
+    for (const auto & [path_in_backup, info] : infos)
+    {
+        writeBinary(path_in_backup, *out);
+        writeVarUInt(info.size, *out);
+        if (info.size)
+        {
+            writeBinary(info.checksum, *out);
+            writeVarUInt(info.base_size, *out);
+            if (info.base_size && (info.base_size != info.size))
+                writeBinary(info.base_checksum, *out);
+        }
+    }
+}
+
+void BackupInDirectory::readContents()
+{
+    auto in = disk->readFile(path_with_sep + ".contents");
+    UInt64 version;
+    readVarUInt(version, *in);
+    if (version != BACKUP_VERSION)
+        throw Exception(ErrorCodes::BACKUP_VERSION_NOT_SUPPORTED, "Backup {}: Version {} is not supported", quoteString(path), version);
+
+    size_t num_infos;
+    readVarUInt(num_infos, *in);
+    infos.clear();
+    for (size_t i = 0; i != num_infos; ++i)
+    {
+        String path_in_backup;
+        readBinary(path_in_backup, *in);
+        EntryInfo info;
+        readVarUInt(info.size, *in);
+        if (info.size)
+        {
+            readBinary(info.checksum, *in);
+            readVarUInt(info.base_size, *in);
+            if (info.base_size && (info.base_size != info.size))
+                readBinary(info.base_checksum, *in);
+            else if (info.base_size)
+                info.base_checksum = info.checksum;
+        }
+        infos.emplace(path_in_backup, info);
+    }
+}
+
+IBackup::OpenMode BackupInDirectory::getOpenMode() const
+{
+    return open_mode;
+}
+
+String BackupInDirectory::getPath() const
+{
+    return path;
+}
+
+Strings BackupInDirectory::list(const String & prefix, const String & terminator) const
+{
+    if (!prefix.ends_with('/') && !prefix.empty())
+        throw Exception("prefix should end with '/'", ErrorCodes::BAD_ARGUMENTS);
+    std::lock_guard lock{mutex};
+    Strings elements;
+    for (auto it = infos.lower_bound(prefix); it != infos.end(); ++it)
+    {
+        const String & name = it->first;
+        if (!name.starts_with(prefix))
+            break;
+        size_t start_pos = prefix.length();
+        size_t end_pos = String::npos;
+        if (!terminator.empty())
+            end_pos = name.find(terminator, start_pos);
+        std::string_view new_element = std::string_view{name}.substr(start_pos, end_pos - start_pos);
+        if (!elements.empty() && (elements.back() == new_element))
+            continue;
+        elements.push_back(String{new_element});
+    }
+    return elements;
+}
+
+bool BackupInDirectory::exists(const String & name) const
+{
+    std::lock_guard lock{mutex};
+    return infos.count(name) != 0;
+}
+
+size_t BackupInDirectory::getSize(const String & name) const
+{
+    std::lock_guard lock{mutex};
+    auto it = infos.find(name);
+    if (it == infos.end())
+        throw Exception(
+            ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "Backup {}: Entry {} not found in the backup", quoteString(path), quoteString(name));
+    return it->second.size;
+}
+
+UInt128 BackupInDirectory::getChecksum(const String & name) const
+{
+    std::lock_guard lock{mutex};
+    auto it = infos.find(name);
+    if (it == infos.end())
+        throw Exception(
+            ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "Backup {}: Entry {} not found in the backup", quoteString(path), quoteString(name));
+    return it->second.checksum;
+}
+
+
+BackupEntryPtr BackupInDirectory::read(const String & name) const
+{
+    std::lock_guard lock{mutex};
+    auto it = infos.find(name);
+    if (it == infos.end())
+        throw Exception(
+            ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "Backup {}: Entry {} not found in the backup", quoteString(path), quoteString(name));
+
+    const auto & info = it->second;
+    if (!info.size)
+    {
+        /// Entry's data is empty.
+        return std::make_unique<BackupEntryFromMemory>(nullptr, 0, UInt128{0, 0});
+    }
+
+    if (!info.base_size)
+    {
+        /// Data goes completely from this backup, the base backup isn't used.
+        return std::make_unique<BackupEntryFromImmutableFile>(disk, path_with_sep + name, info.size, info.checksum);
+    }
+
+    if (info.size < info.base_size)
+    {
+        throw Exception(
+            ErrorCodes::BACKUP_DAMAGED,
+            "Backup {}: Entry {} has its data size less than in the base backup {}: {} < {}",
+            quoteString(path), quoteString(name), quoteString(base_backup->getPath()), info.size, info.base_size);
+    }
+
+    if (!base_backup)
+    {
+        throw Exception(
+            ErrorCodes::NO_BASE_BACKUP,
+            "Backup {}: Entry {} is marked to be read from a base backup, but there is no base backup specified",
+            quoteString(path), quoteString(name));
+    }
+
+    if (!base_backup->exists(name))
+    {
+        throw Exception(
+            ErrorCodes::WRONG_BASE_BACKUP,
+            "Backup {}: Entry {} is marked to be read from a base backup, but doesn't exist there",
+            quoteString(path), quoteString(name));
+    }
+
+    auto base_entry = base_backup->read(name);
+    auto base_size = base_entry->getSize();
+    if (base_size != info.base_size)
+    {
+        throw Exception(
+            ErrorCodes::WRONG_BASE_BACKUP,
+            "Backup {}: Entry {} has unexpected size in the base backup {}: {} (expected size: {})",
+            quoteString(path), quoteString(name), quoteString(base_backup->getPath()), base_size, info.base_size);
+    }
+
+    auto base_checksum = base_entry->getChecksum();
+    if (base_checksum && (*base_checksum != info.base_checksum))
+    {
+        throw Exception(
+            ErrorCodes::WRONG_BASE_BACKUP,
+            "Backup {}: Entry {} has unexpected checksum in the base backup {}",
+            quoteString(path), quoteString(name), quoteString(base_backup->getPath()));
+    }
+
+    if (info.size == info.base_size)
+    {
+        /// Data goes completely from the base backup (nothing goes from this backup).
+        return base_entry;
+    }
+
+    /// The beginning of the data goes from the base backup,
+    /// and the ending goes from this backup.
+    return std::make_unique<BackupEntryConcat>(
+        std::move(base_entry),
+        std::make_unique<BackupEntryFromImmutableFile>(disk, path_with_sep + name, info.size - info.base_size),
+        info.checksum);
+}
+
+
+void BackupInDirectory::write(const String & name, BackupEntryPtr entry)
+{
+    std::lock_guard lock{mutex};
+    if (open_mode != OpenMode::WRITE)
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "Illegal operation: Cannot write to a backup opened for reading");
+
+    if (infos.contains(name))
+        throw Exception(
+            ErrorCodes::BACKUP_ENTRY_ALREADY_EXISTS, "Backup {}: Entry {} already exists", quoteString(path), quoteString(name));
+
+    UInt64 size = entry->getSize();
+    std::optional<UInt128> checksum = entry->getChecksum();
+
+    /// Check if the entry's data is empty.
+    if (!size)
+    {
+        infos.emplace(name, EntryInfo{});
+        return;
+    }
+
+    /// Check if a entry with such name exists in the base backup.
+    bool base_exists = (base_backup && base_backup->exists(name));
+    UInt64 base_size = 0;
+    UInt128 base_checksum{0, 0};
+    if (base_exists)
+    {
+        base_size = base_backup->getSize(name);
+        base_checksum = base_backup->getChecksum(name);
+    }
+
+    std::unique_ptr<ReadBuffer> read_buffer; /// We'll set that later.
+    UInt64 read_pos = 0; /// Current position in read_buffer.
+
+    /// Determine whether it's possible to receive this entry's data from the base backup completely or partly.
+    bool use_base = false;
+    if (base_exists && base_size)
+    {
+        if (size == base_size)
+        {
+            /// The size is the same, we need to compare checksums to find out
+            /// if the entry's data has not been changed since the base backup.
+            if (!checksum)
+            {
+                read_buffer = entry->getReadBuffer();
+                HashingReadBuffer hashing_read_buffer{*read_buffer};
+                hashing_read_buffer.ignore(size);
+                read_pos = size;
+                checksum = hashing_read_buffer.getHash();
+            }
+            if (checksum == base_checksum)
+                use_base = true; /// The data has not been changed.
+        }
+        else if (size > base_size)
+        {
+            /// The size has been increased, we need to calculate a partial checksum to find out
+            /// if the entry's data has been only appended since the base backup.
+            read_buffer = entry->getReadBuffer();
+            HashingReadBuffer hashing_read_buffer{*read_buffer};
+            hashing_read_buffer.ignore(base_size);
+            UInt128 partial_checksum = hashing_read_buffer.getHash();
+            read_pos = base_size;
+            if (!checksum)
+            {
+                hashing_read_buffer.ignore(size - base_size);
+                checksum = hashing_read_buffer.getHash();
+                read_pos = size;
+            }
+            if (partial_checksum == base_checksum)
+                use_base = true; /// The data has been appended.
+        }
+    }
+
+    if (use_base && (size == base_size))
+    {
+        /// The entry's data has not been changed since the base backup.
+        EntryInfo info;
+        info.size = base_size;
+        info.checksum = base_checksum;
+        info.base_size = base_size;
+        info.base_checksum = base_checksum;
+        infos.emplace(name, info);
+        return;
+    }
+
+    {
+        /// Either the entry wasn't exist in the base backup
+        /// or the entry has data appended to the end of the data from the base backup.
+        /// In both those cases we have to copy data to this backup.
+
+        /// Find out where the start position to copy data is.
+        auto copy_pos = use_base ? base_size : 0;
+
+        /// Move the current read position to the start position to copy data.
+        /// If `read_buffer` is seekable it's easier, otherwise we can use ignore().
+        if ((read_pos > copy_pos) && !typeid_cast<SeekableReadBuffer *>(read_buffer.get()))
+        {
+            read_buffer.reset();
+            read_pos = 0;
+        }
+
+        if (!read_buffer)
+            read_buffer = entry->getReadBuffer();
+
+        if (read_pos != copy_pos)
+        {
+            if (auto * seekable_buffer = typeid_cast<SeekableReadBuffer *>(read_buffer.get()))
+                seekable_buffer->seek(copy_pos, SEEK_SET);
+            else if (copy_pos)
+                read_buffer->ignore(copy_pos - read_pos);
+        }
+
+        /// If we haven't received or calculated a checksum yet, calculate it now.
+        ReadBuffer * maybe_hashing_read_buffer = read_buffer.get();
+        std::optional<HashingReadBuffer> hashing_read_buffer;
+        if (!checksum)
+            maybe_hashing_read_buffer = &hashing_read_buffer.emplace(*read_buffer);
+
+        /// Copy the entry's data after `copy_pos`.
+        String out_file_path = path_with_sep + name;
+        disk->createDirectories(directoryPath(out_file_path));
+        auto out = disk->writeFile(out_file_path);
+
+        copyData(*maybe_hashing_read_buffer, *out, size - copy_pos);
+
+        if (hashing_read_buffer)
+            checksum = hashing_read_buffer->getHash();
+
+        /// Done!
+        EntryInfo info;
+        info.size = size;
+        info.checksum = *checksum;
+        if (use_base)
+        {
+            info.base_size = base_size;
+            info.base_checksum = base_checksum;
+        }
+        infos.emplace(name, info);
+    }
+}
+
+void BackupInDirectory::finalizeWriting()
+{
+    if (open_mode != OpenMode::WRITE)
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "Illegal operation: Cannot write to a backup opened for reading");
+    writeContents();
+    finalized = true;
+}
+
+}
--- a/src/Backups/BackupInDirectory.h
+++ b/src/Backups/BackupInDirectory.h
@ -0,0 +1,66 @@
+#pragma once
+
+#include <Backups/IBackup.h>
+#include <map>
+#include <mutex>
+
+
+namespace DB
+{
+class IDisk;
+using DiskPtr = std::shared_ptr<IDisk>;
+
+/// Represents a backup stored on a disk.
+/// A backup is stored as a directory, each entry is stored as a file in that directory.
+/// Also three system files are stored:
+/// 1) ".base" is an XML file with information about the base backup.
+/// 2) ".contents" is a binary file containing a list of all entries along with their sizes
+/// and checksums and information whether the base backup should be used for each entry
+/// 3) ".write_lock" is a temporary empty file which is created before writing of a backup
+/// and deleted after finishing that writing.
+class BackupInDirectory : public IBackup
+{
+public:
+    BackupInDirectory(OpenMode open_mode_, const DiskPtr & disk_, const String & path_, const std::shared_ptr<const IBackup> & base_backup_ = {});
+    ~BackupInDirectory() override;
+
+    OpenMode getOpenMode() const override;
+    String getPath() const override;
+    Strings list(const String & prefix, const String & terminator) const override;
+    bool exists(const String & name) const override;
+    size_t getSize(const String & name) const override;
+    UInt128 getChecksum(const String & name) const override;
+    BackupEntryPtr read(const String & name) const override;
+    void write(const String & name, BackupEntryPtr entry) override;
+    void finalizeWriting() override;
+
+private:
+    void open();
+    void close();
+    void writePathToBaseBackup();
+    void readPathToBaseBackup();
+    void writeContents();
+    void readContents();
+
+    struct EntryInfo
+    {
+        UInt64 size = 0;
+        UInt128 checksum{0, 0};
+
+        /// for incremental backups
+        UInt64 base_size = 0;
+        UInt128 base_checksum{0, 0};
+    };
+
+    const OpenMode open_mode;
+    const DiskPtr disk;
+    String path;
+    String path_with_sep;
+    std::shared_ptr<const IBackup> base_backup;
+    std::map<String, EntryInfo> infos;
+    bool directory_was_created = false;
+    bool finalized = false;
+    mutable std::mutex mutex;
+};
+
+}
--- a/src/Backups/BackupRenamingConfig.cpp
+++ b/src/Backups/BackupRenamingConfig.cpp
@ -0,0 +1,89 @@
+#include <Backups/BackupRenamingConfig.h>
+#include <Parsers/ASTBackupQuery.h>
+
+
+namespace DB
+{
+using Kind = ASTBackupQuery::Kind;
+using ElementType = ASTBackupQuery::ElementType;
+
+void BackupRenamingConfig::setNewTableName(const DatabaseAndTableName & old_table_name, const DatabaseAndTableName & new_table_name)
+{
+    old_to_new_table_names[old_table_name] = new_table_name;
+}
+
+void BackupRenamingConfig::setNewDatabaseName(const String & old_database_name, const String & new_database_name)
+{
+    old_to_new_database_names[old_database_name] = new_database_name;
+}
+
+void BackupRenamingConfig::setNewTemporaryTableName(const String & old_temporary_table_name, const String & new_temporary_table_name)
+{
+    old_to_new_temporary_table_names[old_temporary_table_name] = new_temporary_table_name;
+}
+
+void BackupRenamingConfig::setFromBackupQuery(const ASTBackupQuery & backup_query)
+{
+    setFromBackupQueryElements(backup_query.elements);
+}
+
+void BackupRenamingConfig::setFromBackupQueryElements(const ASTBackupQuery::Elements & backup_query_elements)
+{
+    for (const auto & element : backup_query_elements)
+    {
+        switch (element.type)
+        {
+            case ElementType::TABLE: [[fallthrough]];
+            case ElementType::DICTIONARY:
+            {
+                const auto & new_name = element.new_name.second.empty() ? element.name : element.new_name;
+                setNewTableName(element.name, new_name);
+                break;
+            }
+
+            case ASTBackupQuery::DATABASE:
+            {
+                const auto & new_name = element.new_name.first.empty() ? element.name.first : element.new_name.first;
+                setNewDatabaseName(element.name.first, new_name);
+                break;
+            }
+
+            case ASTBackupQuery::TEMPORARY_TABLE:
+            {
+                const auto & new_name = element.new_name.second.empty() ? element.name.second : element.new_name.second;
+                setNewTemporaryTableName(element.name.second, new_name);
+                break;
+            }
+
+            case ASTBackupQuery::ALL_DATABASES: break;
+            case ASTBackupQuery::ALL_TEMPORARY_TABLES: break;
+            case ASTBackupQuery::EVERYTHING: break;
+        }
+    }
+}
+
+DatabaseAndTableName BackupRenamingConfig::getNewTableName(const DatabaseAndTableName & old_table_name) const
+{
+    auto it = old_to_new_table_names.find(old_table_name);
+    if (it != old_to_new_table_names.end())
+        return it->second;
+    return {getNewDatabaseName(old_table_name.first), old_table_name.second};
+}
+
+const String & BackupRenamingConfig::getNewDatabaseName(const String & old_database_name) const
+{
+    auto it = old_to_new_database_names.find(old_database_name);
+    if (it != old_to_new_database_names.end())
+        return it->second;
+    return old_database_name;
+}
+
+const String & BackupRenamingConfig::getNewTemporaryTableName(const String & old_temporary_table_name) const
+{
+    auto it = old_to_new_temporary_table_names.find(old_temporary_table_name);
+    if (it != old_to_new_temporary_table_names.end())
+        return it->second;
+    return old_temporary_table_name;
+}
+
+}
--- a/src/Backups/BackupRenamingConfig.h
+++ b/src/Backups/BackupRenamingConfig.h
@ -0,0 +1,39 @@
+#pragma once
+
+#include <Parsers/ASTBackupQuery.h>
+#include <Core/Types.h>
+#include <map>
+#include <unordered_map>
+
+
+namespace DB
+{
+using DatabaseAndTableName = std::pair<String, String>;
+
+/// Keeps information about renamings of databases or tables being processed
+/// while we're making a backup or while we're restoring from a backup.
+class BackupRenamingConfig
+{
+public:
+    BackupRenamingConfig() = default;
+
+    void setNewTableName(const DatabaseAndTableName & old_table_name, const DatabaseAndTableName & new_table_name);
+    void setNewDatabaseName(const String & old_database_name, const String & new_database_name);
+    void setNewTemporaryTableName(const String & old_temporary_table_name, const String & new_temporary_table_name);
+    void setFromBackupQuery(const ASTBackupQuery & backup_query);
+    void setFromBackupQueryElements(const ASTBackupQuery::Elements & backup_query_elements);
+
+    /// Changes names according to the renaming.
+    DatabaseAndTableName getNewTableName(const DatabaseAndTableName & old_table_name) const;
+    const String & getNewDatabaseName(const String & old_database_name) const;
+    const String & getNewTemporaryTableName(const String & old_temporary_table_name) const;
+
+private:
+    std::map<DatabaseAndTableName, DatabaseAndTableName> old_to_new_table_names;
+    std::unordered_map<String, String> old_to_new_database_names;
+    std::unordered_map<String, String> old_to_new_temporary_table_names;
+};
+
+using BackupRenamingConfigPtr = std::shared_ptr<const BackupRenamingConfig>;
+
+}
--- a/src/Backups/BackupSettings.cpp
+++ b/src/Backups/BackupSettings.cpp
@ -0,0 +1,6 @@
+#include <Backups/BackupSettings.h>
+
+namespace DB
+{
+IMPLEMENT_SETTINGS_TRAITS(BackupSettingsTraits, LIST_OF_BACKUP_SETTINGS)
+}
--- a/src/Backups/BackupSettings.h
+++ b/src/Backups/BackupSettings.h
@ -0,0 +1,16 @@
+#pragma once
+
+#include <Core/BaseSettings.h>
+
+
+namespace DB
+{
+
+#define LIST_OF_BACKUP_SETTINGS(M) \
+    M(String, base_backup, "", "Name of the base backup. Only differences made after the base backup will be included in a newly created backup, so this option allows to make an incremental backup.", 0) \
+
+DECLARE_SETTINGS_TRAITS_ALLOW_CUSTOM_SETTINGS(BackupSettingsTraits, LIST_OF_BACKUP_SETTINGS)
+
+struct BackupSettings : public BaseSettings<BackupSettingsTraits> {};
+
+}
--- a/src/Backups/BackupUtils.cpp
+++ b/src/Backups/BackupUtils.cpp
@ -0,0 +1,830 @@
+#include <Backups/BackupUtils.h>
+#include <Backups/BackupEntryFromMemory.h>
+#include <Backups/BackupRenamingConfig.h>
+#include <Backups/IBackup.h>
+#include <Backups/hasCompatibleDataToRestoreTable.h>
+#include <Backups/renameInCreateQuery.h>
+#include <Common/escapeForFileName.h>
+#include <Databases/IDatabase.h>
+#include <IO/ReadHelpers.h>
+#include <Interpreters/Context.h>
+#include <Interpreters/InterpreterCreateQuery.h>
+#include <Parsers/ASTCreateQuery.h>
+#include <Parsers/ParserCreateQuery.h>
+#include <Parsers/parseQuery.h>
+#include <Parsers/formatAST.h>
+#include <Storages/IStorage.h>
+#include <common/insertAtEnd.h>
+#include <boost/range/adaptor/reversed.hpp>
+#include <filesystem>
+
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int BACKUP_ELEMENT_DUPLICATE;
+    extern const int BACKUP_IS_EMPTY;
+    extern const int LOGICAL_ERROR;
+    extern const int TABLE_ALREADY_EXISTS;
+    extern const int CANNOT_RESTORE_TABLE;
+}
+
+namespace
+{
+    using Kind = ASTBackupQuery::Kind;
+    using Element = ASTBackupQuery::Element;
+    using Elements = ASTBackupQuery::Elements;
+    using ElementType = ASTBackupQuery::ElementType;
+
+    /// Replace elements of types DICTIONARY or EVERYTHING with elements of other types.
+    void replaceElementTypesWithBaseElementTypes(Elements & elements)
+    {
+        for (size_t i = 0; i != elements.size(); ++i)
+        {
+            auto & element = elements[i];
+            switch (element.type)
+            {
+                case ElementType::DICTIONARY:
+                {
+                    element.type = ElementType::TABLE;
+                    break;
+                }
+
+                case ElementType::EVERYTHING:
+                {
+                    element.type = ElementType::ALL_DATABASES;
+                    auto & new_element = elements.emplace_back();
+                    new_element.type = ElementType::ALL_TEMPORARY_TABLES;
+                    break;
+                }
+
+                default:
+                    break;
+            }
+        }
+    }
+
+    /// Replaces an empty database with the current database.
+    void replaceEmptyDatabaseWithCurrentDatabase(Elements & elements, const String & current_database)
+    {
+        for (auto & element : elements)
+        {
+            if (element.type == ElementType::TABLE)
+            {
+                if (element.name.first.empty() && !element.name.second.empty())
+                    element.name.first = current_database;
+                if (element.new_name.first.empty() && !element.new_name.second.empty())
+                    element.new_name.first = current_database;
+            }
+        }
+    }
+
+    /// Replaces elements of types TEMPORARY_TABLE or ALL_TEMPORARY_TABLES with elements of type TABLE or DATABASE.
+    void replaceTemporaryTablesWithTemporaryDatabase(Elements & elements)
+    {
+        for (size_t i = 0; i != elements.size(); ++i)
+        {
+            auto & element = elements[i];
+            switch (element.type)
+            {
+                case ElementType::TEMPORARY_TABLE:
+                {
+                    element.type = ElementType::TABLE;
+                    element.name.first = DatabaseCatalog::TEMPORARY_DATABASE;
+                    if (element.new_name.first.empty() && !element.new_name.second.empty())
+                        element.new_name.first = DatabaseCatalog::TEMPORARY_DATABASE;
+                    break;
+                }
+
+                case ElementType::ALL_TEMPORARY_TABLES:
+                {
+                    element.type = ElementType::DATABASE;
+                    element.name.first = DatabaseCatalog::TEMPORARY_DATABASE;
+                    break;
+                }
+
+                default:
+                    break;
+            }
+        }
+    }
+
+    /// Set new names if they are not specified.
+    void setNewNamesIfNotSet(Elements & elements)
+    {
+        for (auto & element : elements)
+        {
+            switch (element.type)
+            {
+                case ElementType::TABLE:
+                {
+                    if (element.new_name.second.empty())
+                        element.new_name = element.name;
+                    break;
+                }
+
+                case ElementType::DATABASE:
+                {
+                    if (element.new_name.first.empty())
+                        element.new_name = element.name;
+                    break;
+                }
+
+                default:
+                    break;
+            }
+        }
+    }
+
+    /// Removes duplications in the elements of a backup query by removing some excessive elements and by updating except_lists.
+    /// This function helps deduplicate elements in queries like "BACKUP ALL DATABASES, DATABASE xxx USING NAME yyy"
+    /// (we need a deduplication for that query because `ALL DATABASES` includes `xxx` however we don't want
+    /// to backup/restore the same database twice while executing the same query).
+    /// Also this function slightly reorders elements: it puts databases before tables and dictionaries they contain.
+    void deduplicateAndReorderElements(Elements & elements)
+    {
+        std::set<size_t> skip_indices; /// Indices of elements which should be removed in the end of this function.
+        size_t index_all_databases = static_cast<size_t>(-1); /// Index of the first element of type ALL_DATABASES or -1 if not found.
+
+        struct DatabaseInfo
+        {
+            size_t index = static_cast<size_t>(-1);
+            std::unordered_map<std::string_view, size_t> tables;
+        };
+        std::unordered_map<std::string_view, DatabaseInfo> databases; /// Found databases and tables.
+
+        for (size_t i = 0; i != elements.size(); ++i)
+        {
+            auto & element = elements[i];
+            switch (element.type)
+            {
+                case ElementType::TABLE:
+                {
+                    auto & tables = databases.emplace(element.name.first, DatabaseInfo{}).first->second.tables;
+                    auto it = tables.find(element.name.second);
+                    if (it == tables.end())
+                    {
+                        tables.emplace(element.name.second, i);
+                    }
+                    else
+                    {
+                        size_t prev_index = it->second;
+                        if ((elements[i].new_name == elements[prev_index].new_name)
+                            && (elements[i].partitions.empty() == elements[prev_index].partitions.empty()))
+                        {
+                            insertAtEnd(elements[prev_index].partitions, elements[i].partitions);
+                            skip_indices.emplace(i);
+                        }
+                        else
+                        {
+                            throw Exception(
+                                "Table " + backQuote(element.name.first) + "." + backQuote(element.name.second) + " was specified twice",
+                                ErrorCodes::BACKUP_ELEMENT_DUPLICATE);
+                        }
+                    }
+                    break;
+                }
+
+                case ElementType::DATABASE:
+                {
+                    auto it = databases.find(element.name.first);
+                    if (it == databases.end())
+                    {
+                        DatabaseInfo new_db_info;
+                        new_db_info.index = i;
+                        databases.emplace(element.name.first, new_db_info);
+                    }
+                    else if (it->second.index == static_cast<size_t>(-1))
+                    {
+                        it->second.index = i;
+                    }
+                    else
+                    {
+                        size_t prev_index = it->second.index;
+                        if ((elements[i].new_name == elements[prev_index].new_name)
+                            && (elements[i].except_list == elements[prev_index].except_list))
+                        {
+                            skip_indices.emplace(i);
+                        }
+                        else
+                        {
+                            throw Exception("Database " + backQuote(element.name.first) + " was specified twice", ErrorCodes::BACKUP_ELEMENT_DUPLICATE);
+                        }
+
+                    }
+                    break;
+                }
+
+                case ElementType::ALL_DATABASES:
+                {
+                    if (index_all_databases == static_cast<size_t>(-1))
+                    {
+                        index_all_databases = i;
+                    }
+                    else
+                    {
+                        size_t prev_index = index_all_databases;
+                        if (elements[i].except_list == elements[prev_index].except_list)
+                            skip_indices.emplace(i);
+                        else
+                            throw Exception("The tag ALL DATABASES was specified twice", ErrorCodes::BACKUP_ELEMENT_DUPLICATE);
+                    }
+                    break;
+                }
+
+                default:
+                    /// replaceElementTypesWithBaseElementTypes() and replaceTemporaryTablesWithTemporaryDatabase() should have removed all other element types.
+                    throw Exception("Unexpected element type: " + std::to_string(static_cast<int>(element.type)), ErrorCodes::LOGICAL_ERROR);
+            }
+        }
+
+        if (index_all_databases != static_cast<size_t>(-1))
+        {
+            for (auto & [database_name, database] : databases)
+            {
+                elements[index_all_databases].except_list.emplace(database_name);
+                if (database.index == static_cast<size_t>(-1))
+                {
+                    auto & new_element = elements.emplace_back();
+                    new_element.type = ElementType::DATABASE;
+                    new_element.name.first = database_name;
+                    new_element.new_name = new_element.name;
+                    database.index = elements.size() - 1;
+                }
+            }
+        }
+
+        for (auto & [database_name, database] : databases)
+        {
+            if (database.index == static_cast<size_t>(-1))
+                continue;
+            for (const auto & [table_name, table_index] : database.tables)
+                elements[database.index].except_list.emplace(table_name);
+        }
+
+        /// Reorder the elements: databases should be before tables and dictionaries they contain.
+        for (auto & [database_name, database] : databases)
+        {
+            if (database.index == static_cast<size_t>(-1))
+                continue;
+            size_t min_index = std::numeric_limits<size_t>::max();
+            auto min_index_it = database.tables.end();
+            for (auto it = database.tables.begin(); it != database.tables.end(); ++it)
+            {
+                if (min_index > it->second)
+                {
+                    min_index = it->second;
+                    min_index_it = it;
+                }
+            }
+            if (database.index > min_index)
+            {
+                std::swap(elements[database.index], elements[min_index]);
+                std::swap(database.index, min_index_it->second);
+            }
+        }
+
+        for (auto skip_index : skip_indices | boost::adaptors::reversed)
+            elements.erase(elements.begin() + skip_index);
+    }
+
+    Elements adjustElements(const Elements & elements, const String & current_database)
+    {
+        auto res = elements;
+        replaceElementTypesWithBaseElementTypes(res);
+        replaceEmptyDatabaseWithCurrentDatabase(res, current_database);
+        replaceTemporaryTablesWithTemporaryDatabase(res);
+        setNewNamesIfNotSet(res);
+        deduplicateAndReorderElements(res);
+        return res;
+    }
+
+    String getDataPathInBackup(const DatabaseAndTableName & table_name)
+    {
+        if (table_name.first.empty() || table_name.second.empty())
+            throw Exception(ErrorCodes::LOGICAL_ERROR, "Database name and table name must not be empty");
+        assert(!table_name.first.empty() && !table_name.second.empty());
+        return String{"data/"} + escapeForFileName(table_name.first) + "/" + escapeForFileName(table_name.second) + "/";
+    }
+
+    String getDataPathInBackup(const IAST & create_query)
+    {
+        const auto & create = create_query.as<const ASTCreateQuery &>();
+        if (create.table.empty())
+            return {};
+        if (create.temporary)
+            return getDataPathInBackup({DatabaseCatalog::TEMPORARY_DATABASE, create.table});
+        return getDataPathInBackup({create.database, create.table});
+    }
+
+    String getMetadataPathInBackup(const DatabaseAndTableName & table_name)
+    {
+        if (table_name.first.empty() || table_name.second.empty())
+            throw Exception(ErrorCodes::LOGICAL_ERROR, "Database name and table name must not be empty");
+        return String{"metadata/"} + escapeForFileName(table_name.first) + "/" + escapeForFileName(table_name.second) + ".sql";
+    }
+
+    String getMetadataPathInBackup(const String & database_name)
+    {
+        if (database_name.empty())
+            throw Exception(ErrorCodes::LOGICAL_ERROR, "Database name must not be empty");
+        return String{"metadata/"} + escapeForFileName(database_name) + ".sql";
+    }
+
+    String getMetadataPathInBackup(const IAST & create_query)
+    {
+        const auto & create = create_query.as<const ASTCreateQuery &>();
+        if (create.table.empty())
+            return getMetadataPathInBackup(create.database);
+        if (create.temporary)
+            return getMetadataPathInBackup({DatabaseCatalog::TEMPORARY_DATABASE, create.table});
+        return getMetadataPathInBackup({create.database, create.table});
+    }
+
+    void backupCreateQuery(const IAST & create_query, BackupEntries & backup_entries)
+    {
+        auto metadata_entry = std::make_unique<BackupEntryFromMemory>(serializeAST(create_query));
+        String metadata_path = getMetadataPathInBackup(create_query);
+        backup_entries.emplace_back(metadata_path, std::move(metadata_entry));
+    }
+
+    void backupTable(
+        const DatabaseAndTable & database_and_table,
+        const String & table_name,
+        const ASTs & partitions,
+        const ContextPtr & context,
+        const BackupRenamingConfigPtr & renaming_config,
+        BackupEntries & backup_entries)
+    {
+        const auto & database = database_and_table.first;
+        const auto & storage = database_and_table.second;
+        context->checkAccess(AccessType::SELECT, database->getDatabaseName(), table_name);
+
+        auto create_query = database->getCreateTableQuery(table_name, context);
+        ASTPtr new_create_query = renameInCreateQuery(create_query, renaming_config, context);
+        backupCreateQuery(*new_create_query, backup_entries);
+
+        auto data_backup = storage->backup(partitions, context);
+        if (!data_backup.empty())
+        {
+            String data_path = getDataPathInBackup(*new_create_query);
+            for (auto & [path_in_backup, backup_entry] : data_backup)
+                backup_entries.emplace_back(data_path + path_in_backup, std::move(backup_entry));
+        }
+    }
+
+    void backupDatabase(
+        const DatabasePtr & database,
+        const std::set<String> & except_list,
+        const ContextPtr & context,
+        const BackupRenamingConfigPtr & renaming_config,
+        BackupEntries & backup_entries)
+    {
+        context->checkAccess(AccessType::SHOW_TABLES, database->getDatabaseName());
+
+        auto create_query = database->getCreateDatabaseQuery();
+        ASTPtr new_create_query = renameInCreateQuery(create_query, renaming_config, context);
+        backupCreateQuery(*new_create_query, backup_entries);
+
+        for (auto it = database->getTablesIteratorForBackup(context); it->isValid(); it->next())
+        {
+            if (except_list.contains(it->name()))
+                continue;
+            backupTable({database, it->table()}, it->name(), {}, context, renaming_config, backup_entries);
+        }
+    }
+
+    void backupAllDatabases(
+        const std::set<String> & except_list,
+        const ContextPtr & context,
+        const BackupRenamingConfigPtr & renaming_config,
+        BackupEntries & backup_entries)
+    {
+        for (const auto & [database_name, database] : DatabaseCatalog::instance().getDatabases())
+        {
+            if (except_list.contains(database_name))
+                continue;
+            if (database_name == DatabaseCatalog::SYSTEM_DATABASE || database_name == DatabaseCatalog::TEMPORARY_DATABASE)
+                continue;
+            backupDatabase(database, {}, context, renaming_config, backup_entries);
+        }
+    }
+
+    void makeDatabaseIfNotExists(const String & database_name, ContextMutablePtr context)
+    {
+        if (DatabaseCatalog::instance().isDatabaseExist(database_name))
+            return;
+
+        /// We create and execute `create` query for the database name.
+        auto create_query = std::make_shared<ASTCreateQuery>();
+        create_query->database = database_name;
+        create_query->if_not_exists = true;
+        InterpreterCreateQuery create_interpreter{create_query, context};
+        create_interpreter.execute();
+    }
+
+    ASTPtr readCreateQueryFromBackup(const DatabaseAndTableName & table_name, const BackupPtr & backup)
+    {
+        String create_query_path = getMetadataPathInBackup(table_name);
+        auto read_buffer = backup->read(create_query_path)->getReadBuffer();
+        String create_query_str;
+        readStringUntilEOF(create_query_str, *read_buffer);
+        read_buffer.reset();
+        ParserCreateQuery create_parser;
+        return parseQuery(create_parser, create_query_str, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
+    }
+
+    ASTPtr readCreateQueryFromBackup(const String & database_name, const BackupPtr & backup)
+    {
+        String create_query_path = getMetadataPathInBackup(database_name);
+        auto read_buffer = backup->read(create_query_path)->getReadBuffer();
+        String create_query_str;
+        readStringUntilEOF(create_query_str, *read_buffer);
+        read_buffer.reset();
+        ParserCreateQuery create_parser;
+        return parseQuery(create_parser, create_query_str, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
+    }
+
+    void restoreTable(
+        const DatabaseAndTableName & table_name,
+        const ASTs & partitions,
+        ContextMutablePtr context,
+        const BackupPtr & backup,
+        const BackupRenamingConfigPtr & renaming_config,
+        RestoreObjectsTasks & restore_tasks)
+    {
+        ASTPtr create_query = readCreateQueryFromBackup(table_name, backup);
+        auto new_create_query = typeid_cast<std::shared_ptr<ASTCreateQuery>>(renameInCreateQuery(create_query, renaming_config, context));
+
+        restore_tasks.emplace_back([table_name, new_create_query, partitions, context, backup]() -> RestoreDataTasks
+        {
+            DatabaseAndTableName new_table_name{new_create_query->database, new_create_query->table};
+            if (new_create_query->temporary)
+                new_table_name.first = DatabaseCatalog::TEMPORARY_DATABASE;
+
+            context->checkAccess(AccessType::INSERT, new_table_name.first, new_table_name.second);
+
+            StoragePtr storage;
+            for (size_t try_index = 0; try_index != 10; ++try_index)
+            {
+                if (DatabaseCatalog::instance().isTableExist({new_table_name.first, new_table_name.second}, context))
+                {
+                    DatabasePtr existing_database;
+                    StoragePtr existing_storage;
+                    std::tie(existing_database, existing_storage) = DatabaseCatalog::instance().tryGetDatabaseAndTable({new_table_name.first, new_table_name.second}, context);
+                    if (existing_storage)
+                    {
+                        if (auto existing_table_create_query = existing_database->tryGetCreateTableQuery(new_table_name.second, context))
+                        {
+                            if (hasCompatibleDataToRestoreTable(*new_create_query, existing_table_create_query->as<ASTCreateQuery &>()))
+                            {
+                                storage = existing_storage;
+                                break;
+                            }
+                            else
+                            {
+                                String error_message = (new_table_name.first == DatabaseCatalog::TEMPORARY_DATABASE)
+                                    ? ("Temporary table " + backQuoteIfNeed(new_table_name.second) + " already exists")
+                                    : ("Table " + backQuoteIfNeed(new_table_name.first) + "." + backQuoteIfNeed(new_table_name.second)
+                                       + " already exists");
+                                throw Exception(error_message, ErrorCodes::CANNOT_RESTORE_TABLE);
+                            }
+                        }
+                    }
+                }
+
+                makeDatabaseIfNotExists(new_table_name.first, context);
+
+                try
+                {
+                    InterpreterCreateQuery create_interpreter{new_create_query, context};
+                    create_interpreter.execute();
+                }
+                catch (Exception & e)
+                {
+                    if (e.code() != ErrorCodes::TABLE_ALREADY_EXISTS)
+                        throw;
+                }
+            }
+
+            if (!storage)
+            {
+                String error_message = (new_table_name.first == DatabaseCatalog::TEMPORARY_DATABASE)
+                    ? ("Could not create temporary table " + backQuoteIfNeed(new_table_name.second) + " for restoring")
+                    : ("Could not create table " + backQuoteIfNeed(new_table_name.first) + "." + backQuoteIfNeed(new_table_name.second)
+                       + " for restoring");
+                throw Exception(error_message, ErrorCodes::CANNOT_RESTORE_TABLE);
+            }
+
+            String data_path_in_backup = getDataPathInBackup(table_name);
+            RestoreDataTasks restore_data_tasks = storage->restoreFromBackup(backup, data_path_in_backup, partitions, context);
+
+            /// Keep `storage` alive while we're executing `restore_data_tasks`.
+            for (auto & restore_data_task : restore_data_tasks)
+                restore_data_task = [restore_data_task, storage]() { restore_data_task(); };
+
+            return restore_data_tasks;
+        });
+    }
+
+    void restoreDatabase(const String & database_name, const std::set<String> & except_list, ContextMutablePtr context, const BackupPtr & backup, const BackupRenamingConfigPtr & renaming_config, RestoreObjectsTasks & restore_tasks)
+    {
+        ASTPtr create_query = readCreateQueryFromBackup(database_name, backup);
+        auto new_create_query = typeid_cast<std::shared_ptr<ASTCreateQuery>>(renameInCreateQuery(create_query, renaming_config, context));
+
+        restore_tasks.emplace_back([database_name, new_create_query, except_list, context, backup, renaming_config]() -> RestoreDataTasks
+        {
+            const String & new_database_name = new_create_query->database;
+            context->checkAccess(AccessType::SHOW_TABLES, new_database_name);
+
+            if (!DatabaseCatalog::instance().isDatabaseExist(new_database_name))
+            {
+                /// We create and execute `create` query for the database name.
+                new_create_query->if_not_exists = true;
+                InterpreterCreateQuery create_interpreter{new_create_query, context};
+                create_interpreter.execute();
+            }
+
+            RestoreObjectsTasks restore_objects_tasks;
+            Strings table_names = backup->list("metadata/" + escapeForFileName(database_name) + "/", "/");
+            for (const String & table_name : table_names)
+            {
+                if (except_list.contains(table_name))
+                    continue;
+                restoreTable({database_name, table_name}, {}, context, backup, renaming_config, restore_objects_tasks);
+            }
+
+            RestoreDataTasks restore_data_tasks;
+            for (auto & restore_object_task : restore_objects_tasks)
+                insertAtEnd(restore_data_tasks, std::move(restore_object_task)());
+            return restore_data_tasks;
+        });
+    }
+
+    void restoreAllDatabases(const std::set<String> & except_list, ContextMutablePtr context, const BackupPtr & backup, const BackupRenamingConfigPtr & renaming_config, RestoreObjectsTasks & restore_tasks)
+    {
+        restore_tasks.emplace_back([except_list, context, backup, renaming_config]() -> RestoreDataTasks
+        {
+            Strings database_names = backup->list("metadata/", "/");
+            RestoreObjectsTasks restore_objects_tasks;
+            for (const String & database_name : database_names)
+            {
+                if (except_list.contains(database_name))
+                    continue;
+                restoreDatabase(database_name, {}, context, backup, renaming_config, restore_objects_tasks);
+            }
+
+            RestoreDataTasks restore_data_tasks;
+            for (auto & restore_object_task : restore_objects_tasks)
+                insertAtEnd(restore_data_tasks, std::move(restore_object_task)());
+            return restore_data_tasks;
+        });
+    }
+}
+
+
+BackupEntries makeBackupEntries(const Elements & elements, const ContextPtr & context)
+{
+    BackupEntries backup_entries;
+
+    auto elements2 = adjustElements(elements, context->getCurrentDatabase());
+    auto renaming_config = std::make_shared<BackupRenamingConfig>();
+    renaming_config->setFromBackupQueryElements(elements2);
+
+    for (const auto & element : elements2)
+    {
+        switch (element.type)
+        {
+            case ElementType::TABLE:
+            {
+                const String & database_name = element.name.first;
+                const String & table_name = element.name.second;
+                auto [database, storage] = DatabaseCatalog::instance().getDatabaseAndTable({database_name, table_name}, context);
+                backupTable({database, storage}, table_name, element.partitions, context, renaming_config, backup_entries);
+                break;
+            }
+
+            case ElementType::DATABASE:
+            {
+                const String & database_name = element.name.first;
+                auto database = DatabaseCatalog::instance().getDatabase(database_name, context);
+                backupDatabase(database, element.except_list, context, renaming_config, backup_entries);
+                break;
+            }
+
+            case ElementType::ALL_DATABASES:
+            {
+                backupAllDatabases(element.except_list, context, renaming_config, backup_entries);
+                break;
+            }
+
+            default:
+                throw Exception("Unexpected element type", ErrorCodes::LOGICAL_ERROR); /// other element types have been removed in deduplicateElements()
+        }
+    }
+
+    /// A backup cannot be empty.
+    if (backup_entries.empty())
+        throw Exception("Backup must not be empty", ErrorCodes::BACKUP_IS_EMPTY);
+
+    /// Check that all backup entries are unique.
+    std::sort(
+        backup_entries.begin(),
+        backup_entries.end(),
+        [](const std::pair<String, std::unique_ptr<IBackupEntry>> & lhs, const std::pair<String, std::unique_ptr<IBackupEntry>> & rhs)
+        {
+            return lhs.first < rhs.first;
+        });
+    auto adjacent = std::adjacent_find(backup_entries.begin(), backup_entries.end());
+    if (adjacent != backup_entries.end())
+        throw Exception("Cannot write multiple entries with the same name " + quoteString(adjacent->first), ErrorCodes::BACKUP_ELEMENT_DUPLICATE);
+
+    return backup_entries;
+}
+
+UInt64 estimateBackupSize(const BackupEntries & backup_entries, const BackupPtr & base_backup)
+{
+    UInt64 total_size = 0;
+    for (const auto & [name, entry] : backup_entries)
+    {
+        UInt64 data_size = entry->getSize();
+        if (base_backup)
+        {
+            if (base_backup->exists(name) && (data_size == base_backup->getSize(name)))
+            {
+                auto checksum = entry->getChecksum();
+                if (checksum && (*checksum == base_backup->getChecksum(name)))
+                    continue;
+            }
+        }
+        total_size += data_size;
+    }
+    return total_size;
+}
+
+void writeBackupEntries(BackupMutablePtr backup, BackupEntries && backup_entries, size_t num_threads)
+{
+    if (!num_threads)
+        num_threads = 1;
+    std::vector<ThreadFromGlobalPool> threads;
+    size_t num_active_threads = 0;
+    std::mutex mutex;
+    std::condition_variable cond;
+    std::exception_ptr exception;
+
+    for (auto & name_and_entry : backup_entries)
+    {
+        auto & name = name_and_entry.first;
+        auto & entry = name_and_entry.second;
+
+        {
+            std::unique_lock lock{mutex};
+            if (exception)
+                break;
+            cond.wait(lock, [&] { return num_active_threads < num_threads; });
+            if (exception)
+                break;
+            ++num_active_threads;
+        }
+
+        threads.emplace_back([backup, &name, &entry, &mutex, &cond, &num_active_threads, &exception]()
+        {
+            try
+            {
+                backup->write(name, std::move(entry));
+            }
+            catch (...)
+            {
+                std::lock_guard lock{mutex};
+                if (!exception)
+                    exception = std::current_exception();
+            }
+
+            {
+                std::lock_guard lock{mutex};
+                --num_active_threads;
+                cond.notify_all();
+            }
+        });
+    }
+
+    for (auto & thread : threads)
+        thread.join();
+
+    backup_entries.clear();
+
+    if (exception)
+    {
+        /// We don't call finalizeWriting() if an error occurs.
+        /// And IBackup's implementation should remove the backup in its destructor if finalizeWriting() hasn't called before.
+        std::rethrow_exception(exception);
+    }
+
+    backup->finalizeWriting();
+}
+
+
+RestoreObjectsTasks makeRestoreTasks(const Elements & elements, ContextMutablePtr context, const BackupPtr & backup)
+{
+    RestoreObjectsTasks restore_tasks;
+
+    auto elements2 = adjustElements(elements, context->getCurrentDatabase());
+    auto renaming_config = std::make_shared<BackupRenamingConfig>();
+    renaming_config->setFromBackupQueryElements(elements2);
+
+    for (const auto & element : elements2)
+    {
+        switch (element.type)
+        {
+            case ElementType::TABLE:
+            {
+                const String & database_name = element.name.first;
+                const String & table_name = element.name.second;
+                restoreTable({database_name, table_name}, element.partitions, context, backup, renaming_config, restore_tasks);
+                break;
+            }
+
+            case ElementType::DATABASE:
+            {
+                const String & database_name = element.name.first;
+                auto database = DatabaseCatalog::instance().getDatabase(database_name, context);
+                restoreDatabase(database_name, element.except_list, context, backup, renaming_config, restore_tasks);
+                break;
+            }
+
+            case ElementType::ALL_DATABASES:
+            {
+                restoreAllDatabases(element.except_list, context, backup, renaming_config, restore_tasks);
+                break;
+            }
+
+            default:
+                throw Exception("Unexpected element type", ErrorCodes::LOGICAL_ERROR); /// other element types have been removed in deduplicateElements()
+        }
+    }
+
+    return restore_tasks;
+}
+
+
+void executeRestoreTasks(RestoreObjectsTasks && restore_tasks, size_t num_threads)
+{
+    if (!num_threads)
+        num_threads = 1;
+
+    RestoreDataTasks restore_data_tasks;
+    for (auto & restore_object_task : restore_tasks)
+        insertAtEnd(restore_data_tasks, std::move(restore_object_task)());
+    restore_tasks.clear();
+
+    std::vector<ThreadFromGlobalPool> threads;
+    size_t num_active_threads = 0;
+    std::mutex mutex;
+    std::condition_variable cond;
+    std::exception_ptr exception;
+
+    for (auto & restore_data_task : restore_data_tasks)
+    {
+        {
+            std::unique_lock lock{mutex};
+            if (exception)
+                break;
+            cond.wait(lock, [&] { return num_active_threads < num_threads; });
+            if (exception)
+                break;
+            ++num_active_threads;
+        }
+
+        threads.emplace_back([&restore_data_task, &mutex, &cond, &num_active_threads, &exception]() mutable
+        {
+            try
+            {
+                restore_data_task();
+                restore_data_task = {};
+            }
+            catch (...)
+            {
+                std::lock_guard lock{mutex};
+                if (!exception)
+                    exception = std::current_exception();
+            }
+
+            {
+                std::lock_guard lock{mutex};
+                --num_active_threads;
+                cond.notify_all();
+            }
+        });
+    }
+
+    for (auto & thread : threads)
+        thread.join();
+
+    restore_data_tasks.clear();
+
+    if (exception)
+        std::rethrow_exception(exception);
+}
+
+}
--- a/src/Backups/BackupUtils.h
+++ b/src/Backups/BackupUtils.h
@ -0,0 +1,39 @@
+#pragma once
+
+#include <Parsers/ASTBackupQuery.h>
+
+
+namespace DB
+{
+
+class IBackup;
+using BackupPtr = std::shared_ptr<const IBackup>;
+using BackupMutablePtr = std::shared_ptr<IBackup>;
+class IBackupEntry;
+using BackupEntryPtr = std::unique_ptr<IBackupEntry>;
+using BackupEntries = std::vector<std::pair<String, BackupEntryPtr>>;
+using RestoreDataTask = std::function<void()>;
+using RestoreDataTasks = std::vector<RestoreDataTask>;
+using RestoreObjectTask = std::function<RestoreDataTasks()>;
+using RestoreObjectsTasks = std::vector<RestoreObjectTask>;
+class Context;
+using ContextPtr = std::shared_ptr<const Context>;
+using ContextMutablePtr = std::shared_ptr<Context>;
+
+
+/// Prepares backup entries.
+BackupEntries makeBackupEntries(const ASTBackupQuery::Elements & elements, const ContextPtr & context);
+
+/// Estimate total size of the backup which would be written from the specified entries.
+UInt64 estimateBackupSize(const BackupEntries & backup_entries, const BackupPtr & base_backup);
+
+/// Write backup entries to an opened backup.
+void writeBackupEntries(BackupMutablePtr backup, BackupEntries && backup_entries, size_t num_threads);
+
+/// Prepare restore tasks.
+RestoreObjectsTasks makeRestoreTasks(const ASTBackupQuery::Elements & elements, ContextMutablePtr context, const BackupPtr & backup);
+
+/// Execute restore tasks.
+void executeRestoreTasks(RestoreObjectsTasks && restore_tasks, size_t num_threads);
+
+}
--- a/src/Backups/CMakeLists.txt
+++ b/src/Backups/CMakeLists.txt
--- a/src/Backups/IBackup.h
+++ b/src/Backups/IBackup.h
@ -0,0 +1,65 @@
+#pragma once
+
+#include <Core/Types.h>
+#include <memory>
+
+
+namespace DB
+{
+class IBackupEntry;
+using BackupEntryPtr = std::unique_ptr<IBackupEntry>;
+
+/// Represents a backup, i.e. a storage of BackupEntries which can be accessed by their names.
+/// A backup can be either incremental or non-incremental. An incremental backup doesn't store
+/// the data of the entries which are not changed compared to its base backup.
+class IBackup
+{
+public:
+    virtual ~IBackup() = default;
+
+    enum class OpenMode
+    {
+        READ,
+        WRITE,
+    };
+
+    /// A backup can be open either in READ or WRITE mode.
+    virtual OpenMode getOpenMode() const = 0;
+
+    /// Returns the path to the backup.
+    virtual String getPath() const = 0;
+
+    /// Returns names of entries stored in the backup.
+    /// If `prefix` isn't empty the function will return only the names starting with
+    /// the prefix (but without the prefix itself).
+    /// If the `terminator` isn't empty the function will returns only parts of the names
+    /// before the terminator. For example, list("", "") returns names of all the entries
+    /// in the backup; and list("data/", "/") return kind of a list of folders and
+    /// files stored in the "data/" directory inside the backup.
+    virtual Strings list(const String & prefix = "", const String & terminator = "/") const = 0;
+
+    /// Checks if an entry with a specified name exists.
+    virtual bool exists(const String & name) const = 0;
+
+    /// Returns the size of the entry's data.
+    /// This function does the same as `read(name)->getSize()` but faster.
+    virtual size_t getSize(const String & name) const = 0;
+
+    /// Returns the checksum of the entry's data.
+    /// This function does the same as `read(name)->getCheckum()` but faster.
+    virtual UInt128 getChecksum(const String & name) const = 0;
+
+    /// Reads an entry from the backup.
+    virtual BackupEntryPtr read(const String & name) const = 0;
+
+    /// Puts a new entry to the backup.
+    virtual void write(const String & name, BackupEntryPtr entry) = 0;
+
+    /// Finalizes writing the backup, should be called after all entries have been successfully written.
+    virtual void finalizeWriting() = 0;
+};
+
+using BackupPtr = std::shared_ptr<const IBackup>;
+using BackupMutablePtr = std::shared_ptr<IBackup>;
+
+}
--- a/src/Backups/IBackupEntry.h
+++ b/src/Backups/IBackupEntry.h
@ -0,0 +1,32 @@
+#pragma once
+
+#include <Core/Types.h>
+#include <memory>
+#include <optional>
+#include <vector>
+
+namespace DB
+{
+class ReadBuffer;
+
+/// A backup entry represents some data which should be written to the backup or has been read from the backup.
+class IBackupEntry
+{
+public:
+    virtual ~IBackupEntry() = default;
+
+    /// Returns the size of the data.
+    virtual UInt64 getSize() const = 0;
+
+    /// Returns the checksum of the data if it's precalculated.
+    /// Can return nullopt which means the checksum should be calculated from the read buffer.
+    virtual std::optional<UInt128> getChecksum() const { return {}; }
+
+    /// Returns a read buffer for reading the data.
+    virtual std::unique_ptr<ReadBuffer> getReadBuffer() const = 0;
+};
+
+using BackupEntryPtr = std::unique_ptr<IBackupEntry>;
+using BackupEntries = std::vector<std::pair<String, BackupEntryPtr>>;
+
+}
--- a/src/Backups/hasCompatibleDataToRestoreTable.cpp
+++ b/src/Backups/hasCompatibleDataToRestoreTable.cpp
@ -0,0 +1,22 @@
+#include <Backups/hasCompatibleDataToRestoreTable.h>
+#include <Parsers/ASTCreateQuery.h>
+#include <Parsers/formatAST.h>
+
+
+namespace DB
+{
+
+bool hasCompatibleDataToRestoreTable(const ASTCreateQuery & query1, const ASTCreateQuery & query2)
+{
+    /// TODO: Write more subtle condition here.
+    auto q1 = typeid_cast<std::shared_ptr<ASTCreateQuery>>(query1.clone());
+    auto q2 = typeid_cast<std::shared_ptr<ASTCreateQuery>>(query2.clone());
+
+    /// Remove UUIDs.
+    q1->uuid = UUIDHelpers::Nil;
+    q2->uuid = UUIDHelpers::Nil;
+
+    return serializeAST(*q1) == serializeAST(*q2);
+}
+
+}
--- a/src/Backups/hasCompatibleDataToRestoreTable.h
+++ b/src/Backups/hasCompatibleDataToRestoreTable.h
@ -0,0 +1,11 @@
+#pragma once
+
+
+namespace DB
+{
+class ASTCreateQuery;
+
+/// Whether the data of the first table can be inserted to the second table.
+bool hasCompatibleDataToRestoreTable(const ASTCreateQuery & query1, const ASTCreateQuery & query2);
+
+}
--- a/src/Backups/renameInCreateQuery.cpp
+++ b/src/Backups/renameInCreateQuery.cpp
@ -0,0 +1,276 @@
+#include <Backups/renameInCreateQuery.h>
+#include <Backups/BackupRenamingConfig.h>
+#include <Parsers/ASTCreateQuery.h>
+#include <Parsers/ASTFunction.h>
+#include <Parsers/ASTLiteral.h>
+#include <Parsers/ASTTablesInSelectQuery.h>
+#include <TableFunctions/TableFunctionFactory.h>
+#include <Interpreters/InDepthNodeVisitor.h>
+#include <Interpreters/evaluateConstantExpression.h>
+
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int LOGICAL_ERROR;
+}
+
+namespace
+{
+    class RenameInCreateQueryTransformMatcher
+    {
+    public:
+        struct Data
+        {
+            BackupRenamingConfigPtr renaming_config;
+            ContextPtr context;
+        };
+
+        static bool needChildVisit(ASTPtr &, const ASTPtr &) { return true; }
+
+        static void visit(ASTPtr & ast, const Data & data)
+        {
+            if (auto * create = ast->as<ASTCreateQuery>())
+                visitCreateQuery(*create, data);
+            else if (auto * expr = ast->as<ASTTableExpression>())
+                visitTableExpression(*expr, data);
+            else if (auto * function = ast->as<ASTFunction>())
+                visitFunction(*function, data);
+            else if (auto * dictionary = ast->as<ASTDictionary>())
+                visitDictionary(*dictionary, data);
+        }
+
+    private:
+        /// Replaces names of tables and databases used in a CREATE query, which can be either CREATE TABLE or
+        /// CREATE DICTIONARY or CREATE VIEW or CREATE TEMPORARY TABLE or CREATE DATABASE query.
+        static void visitCreateQuery(ASTCreateQuery & create, const Data & data)
+        {
+            if (create.temporary)
+            {
+                if (create.table.empty())
+                    throw Exception(ErrorCodes::LOGICAL_ERROR, "Table name specified in the CREATE TEMPORARY TABLE query must not be empty");
+                create.table = data.renaming_config->getNewTemporaryTableName(create.table);
+            }
+            else if (create.table.empty())
+            {
+                if (create.database.empty())
+                    throw Exception(ErrorCodes::LOGICAL_ERROR, "Database name specified in the CREATE DATABASE query must not be empty");
+                create.database = data.renaming_config->getNewDatabaseName(create.database);
+            }
+            else
+            {
+                if (create.database.empty())
+                    throw Exception(ErrorCodes::LOGICAL_ERROR, "Database name specified in the CREATE TABLE query must not be empty");
+                std::tie(create.database, create.table) = data.renaming_config->getNewTableName({create.database, create.table});
+            }
+
+            create.uuid = UUIDHelpers::Nil;
+
+            if (!create.as_table.empty() && !create.as_database.empty())
+                std::tie(create.as_database, create.as_table) = data.renaming_config->getNewTableName({create.as_database, create.as_table});
+
+            if (!create.to_table_id.table_name.empty() && !create.to_table_id.database_name.empty())
+            {
+                auto to_table = data.renaming_config->getNewTableName({create.to_table_id.database_name, create.to_table_id.table_name});
+                create.to_table_id = StorageID{to_table.first, to_table.second};
+            }
+        }
+
+        /// Replaces names of a database and a table in a expression like `db`.`table`
+        static void visitTableExpression(ASTTableExpression & expr, const Data & data)
+        {
+            if (!expr.database_and_table_name)
+                return;
+
+            ASTIdentifier * id = expr.database_and_table_name->as<ASTIdentifier>();
+            if (!id)
+                return;
+
+            auto table_id = id->createTable();
+            if (!table_id)
+                return;
+
+            const String & db_name = table_id->getDatabaseName();
+            const String & table_name = table_id->shortName();
+            if (db_name.empty() || table_name.empty())
+                return;
+
+            String new_db_name, new_table_name;
+            std::tie(new_db_name, new_table_name) = data.renaming_config->getNewTableName({db_name, table_name});
+            if ((new_db_name == db_name) && (new_table_name == table_name))
+                return;
+
+            expr.database_and_table_name = std::make_shared<ASTIdentifier>(Strings{new_db_name, new_table_name});
+            expr.children.push_back(expr.database_and_table_name);
+        }
+
+        /// Replaces names of tables and databases used in arguments of a table function or a table engine.
+        static void visitFunction(ASTFunction & function, const Data & data)
+        {
+            if ((function.name == "merge") || (function.name == "Merge"))
+            {
+                visitFunctionMerge(function, data);
+            }
+            else if ((function.name == "remote") || (function.name == "remoteSecure") || (function.name == "cluster") ||
+                     (function.name == "clusterAllReplicas") || (function.name == "Distributed"))
+            {
+                visitFunctionRemote(function, data);
+            }
+        }
+
+        /// Replaces a database's name passed via an argument of the function merge() or the table engine Merge.
+        static void visitFunctionMerge(ASTFunction & function, const Data & data)
+        {
+            if (!function.arguments)
+                return;
+
+            /// The first argument is a database's name and we can rename it.
+            /// The second argument is a regular expression and we can do nothing about it.
+            auto & args = function.arguments->as<ASTExpressionList &>().children;
+            size_t db_name_arg_index = 0;
+            if (args.size() <= db_name_arg_index)
+                return;
+
+            String db_name = evaluateConstantExpressionForDatabaseName(args[db_name_arg_index], data.context)->as<ASTLiteral &>().value.safeGet<String>();
+            if (db_name.empty())
+                return;
+
+            String new_db_name = data.renaming_config->getNewDatabaseName(db_name);
+            if (new_db_name == db_name)
+                return;
+            args[db_name_arg_index] = std::make_shared<ASTLiteral>(new_db_name);
+        }
+
+        /// Replaces names of a table and a database passed via arguments of the function remote() or cluster() or the table engine Distributed.
+        static void visitFunctionRemote(ASTFunction & function, const Data & data)
+        {
+            if (!function.arguments)
+                return;
+
+            /// The first argument is an address or cluster's name, so we skip it.
+            /// The second argument can be either 'db.name' or just 'db' followed by the third argument 'table'.
+            auto & args = function.arguments->as<ASTExpressionList &>().children;
+
+            const auto * second_arg_as_function = args[1]->as<ASTFunction>();
+            if (second_arg_as_function && TableFunctionFactory::instance().isTableFunctionName(second_arg_as_function->name))
+                return;
+
+            size_t db_name_index = 1;
+            if (args.size() <= db_name_index)
+                return;
+
+            String db_name = evaluateConstantExpressionForDatabaseName(args[db_name_index], data.context)->as<ASTLiteral &>().value.safeGet<String>();
+
+            String table_name;
+            size_t table_name_index = static_cast<size_t>(-1);
+            size_t dot = String::npos;
+            if (function.name != "Distributed")
+                dot = db_name.find('.');
+            if (dot != String::npos)
+            {
+                table_name = db_name.substr(dot + 1);
+                db_name.resize(dot);
+            }
+            else
+            {
+                table_name_index = 2;
+                if (args.size() <= table_name_index)
+                    return;
+                table_name = evaluateConstantExpressionForDatabaseName(args[table_name_index], data.context)->as<ASTLiteral &>().value.safeGet<String>();
+            }
+
+            if (db_name.empty() || table_name.empty())
+                return;
+
+            String new_db_name, new_table_name;
+            std::tie(new_db_name, new_table_name) = data.renaming_config->getNewTableName({db_name, table_name});
+            if ((new_db_name == db_name) && (new_table_name == table_name))
+                return;
+
+            if (table_name_index != static_cast<size_t>(-1))
+            {
+                if (new_db_name != db_name)
+                    args[db_name_index] = std::make_shared<ASTLiteral>(new_db_name);
+                if (new_table_name != table_name)
+                    args[table_name_index] = std::make_shared<ASTLiteral>(new_table_name);
+            }
+            else
+            {
+                args[db_name_index] = std::make_shared<ASTLiteral>(new_db_name);
+                args.insert(args.begin() + db_name_index + 1, std::make_shared<ASTLiteral>(new_table_name));
+            }
+        }
+
+        /// Replaces names of a table and a database used in source parameters of a dictionary.
+        static void visitDictionary(ASTDictionary & dictionary, const Data & data)
+        {
+            if (!dictionary.source || dictionary.source->name != "clickhouse" || !dictionary.source->elements)
+                return;
+
+            auto & elements = dictionary.source->elements->as<ASTExpressionList &>().children;
+            String db_name, table_name;
+            size_t db_name_index = static_cast<size_t>(-1);
+            size_t table_name_index = static_cast<size_t>(-1);
+
+            for (size_t i = 0; i != elements.size(); ++i)
+            {
+                auto & pair = elements[i]->as<ASTPair &>();
+                if (pair.first == "db")
+                {
+                    if (db_name_index != static_cast<size_t>(-1))
+                        return;
+                    db_name = pair.second->as<ASTLiteral &>().value.safeGet<String>();
+                    db_name_index = i;
+                }
+                else if (pair.first == "table")
+                {
+                    if (table_name_index != static_cast<size_t>(-1))
+                        return;
+                    table_name = pair.second->as<ASTLiteral &>().value.safeGet<String>();
+                    table_name_index = i;
+                }
+            }
+
+            if (db_name.empty() || table_name.empty())
+                return;
+
+            String new_db_name, new_table_name;
+            std::tie(new_db_name, new_table_name) = data.renaming_config->getNewTableName({db_name, table_name});
+            if ((new_db_name == db_name) && (new_table_name == table_name))
+                return;
+
+            if (new_db_name != db_name)
+            {
+                auto & pair = elements[db_name_index]->as<ASTPair &>();
+                pair.replace(pair.second, std::make_shared<ASTLiteral>(new_db_name));
+            }
+            if (new_table_name != table_name)
+            {
+                auto & pair = elements[table_name_index]->as<ASTPair &>();
+                pair.replace(pair.second, std::make_shared<ASTLiteral>(new_table_name));
+            }
+        }
+    };
+
+    using RenameInCreateQueryTransformVisitor = InDepthNodeVisitor<RenameInCreateQueryTransformMatcher, false>;
+}
+
+
+ASTPtr renameInCreateQuery(const ASTPtr & ast, const BackupRenamingConfigPtr & renaming_config, const ContextPtr & context)
+{
+    auto new_ast = ast->clone();
+    try
+    {
+        RenameInCreateQueryTransformVisitor::Data data{renaming_config, context};
+        RenameInCreateQueryTransformVisitor{data}.visit(new_ast);
+        return new_ast;
+    }
+    catch (...)
+    {
+        tryLogCurrentException("Backup", "Error while renaming in AST");
+        return ast;
+    }
+}
+
+}
--- a/src/Backups/renameInCreateQuery.h
+++ b/src/Backups/renameInCreateQuery.h
@ -0,0 +1,16 @@
+#pragma once
+
+#include <memory>
+
+namespace DB
+{
+class IAST;
+using ASTPtr = std::shared_ptr<IAST>;
+class Context;
+using ContextPtr = std::shared_ptr<const Context>;
+class BackupRenamingConfig;
+using BackupRenamingConfigPtr = std::shared_ptr<const BackupRenamingConfig>;
+
+/// Changes names in AST according to the renaming settings.
+ASTPtr renameInCreateQuery(const ASTPtr & ast, const BackupRenamingConfigPtr & renaming_config, const ContextPtr & context);
+}
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@ -45,6 +45,7 @@ if (COMPILER_GCC)
 endif ()

 add_subdirectory (Access)
+add_subdirectory (Backups)
 add_subdirectory (Columns)
 add_subdirectory (Common)
 add_subdirectory (Core)
@ -180,6 +181,7 @@ macro(add_object_library name common_path)
 endmacro()

 add_object_library(clickhouse_access Access)
+add_object_library(clickhouse_backups Backups)
 add_object_library(clickhouse_core Core)
 add_object_library(clickhouse_core_mysql Core/MySQL)
 add_object_library(clickhouse_compression Compression)
--- a/src/Common/ErrorCodes.cpp
+++ b/src/Common/ErrorCodes.cpp
@ -566,7 +566,17 @@
    M(595, BZIP2_STREAM_ENCODER_FAILED) \
    M(596, INTERSECT_OR_EXCEPT_RESULT_STRUCTURES_MISMATCH) \
    M(597, NO_SUCH_ERROR_CODE) \
-    M(598, PARTITION_BY_NOT_SUPPORTED) \
+    M(598, BACKUP_ALREADY_EXISTS) \
+    M(599, BACKUP_NOT_FOUND) \
+    M(600, BACKUP_VERSION_NOT_SUPPORTED) \
+    M(601, BACKUP_DAMAGED) \
+    M(602, NO_BASE_BACKUP) \
+    M(603, WRONG_BASE_BACKUP) \
+    M(604, BACKUP_ENTRY_ALREADY_EXISTS) \
+    M(605, BACKUP_ENTRY_NOT_FOUND) \
+    M(606, BACKUP_IS_EMPTY) \
+    M(607, BACKUP_ELEMENT_DUPLICATE) \
+    M(608, CANNOT_RESTORE_TABLE) \
    \
    M(998, POSTGRESQL_CONNECTION_FAILURE) \
    M(999, KEEPER_EXCEPTION) \
--- a/src/Common/StringUtils/StringUtils.h
+++ b/src/Common/StringUtils/StringUtils.h
@ -276,14 +276,30 @@ inline void trimLeft(std::string_view & str, char c = ' ')
        str.remove_prefix(1);
 }

+inline void trimLeft(std::string & str, char c = ' ')
+{
+    str.erase(0, str.find_first_not_of(c));
+}
+
 inline void trimRight(std::string_view & str, char c = ' ')
 {
    while (str.ends_with(c))
        str.remove_suffix(1);
 }

+inline void trimRight(std::string & str, char c = ' ')
+{
+    str.erase(str.find_last_not_of(c) + 1);
+}
+
 inline void trim(std::string_view & str, char c = ' ')
 {
    trimLeft(str, c);
    trimRight(str, c);
 }
+
+inline void trim(std::string & str, char c = ' ')
+{
+    trimRight(str, c);
+    trimLeft(str, c);
+}
--- a/src/Core/Settings.h
+++ b/src/Core/Settings.h
@ -354,6 +354,8 @@ class IColumn;
    M(UInt64, max_network_bandwidth_for_user, 0, "The maximum speed of data exchange over the network in bytes per second for all concurrently running user queries. Zero means unlimited.", 0)\
    M(UInt64, max_network_bandwidth_for_all_users, 0, "The maximum speed of data exchange over the network in bytes per second for all concurrently running queries. Zero means unlimited.", 0) \
    \
+    M(UInt64, max_backup_threads, 0, "The maximum number of threads to execute a BACKUP or RESTORE request. By default, it is determined automatically.", 0) \
+    \
    M(Bool, log_profile_events, true, "Log query performance statistics into the query_log, query_thread_log and query_views_log.", 0) \
    M(Bool, log_query_settings, true, "Log query settings into the query_log.", 0) \
    M(Bool, log_query_threads, true, "Log query threads into system.query_thread_log table. This setting have effect only when 'log_queries' is true.", 0) \
--- a/src/Databases/DatabaseAtomic.cpp
+++ b/src/Databases/DatabaseAtomic.cpp
@ -403,7 +403,7 @@ void DatabaseAtomic::assertCanBeDetached(bool cleanup)
 }

 DatabaseTablesIteratorPtr
-DatabaseAtomic::getTablesIterator(ContextPtr local_context, const IDatabase::FilterByNameFunction & filter_by_table_name)
+DatabaseAtomic::getTablesIterator(ContextPtr local_context, const IDatabase::FilterByNameFunction & filter_by_table_name) const
 {
    auto base_iter = DatabaseWithOwnTablesBase::getTablesIterator(local_context, filter_by_table_name);
    return std::make_unique<AtomicDatabaseTablesSnapshotIterator>(std::move(typeid_cast<DatabaseTablesSnapshotIterator &>(*base_iter)));
--- a/src/Databases/DatabaseAtomic.h
+++ b/src/Databases/DatabaseAtomic.h
@ -45,7 +45,7 @@ public:

    void drop(ContextPtr /*context*/) override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach) override;

--- a/src/Databases/DatabaseDictionary.cpp
+++ b/src/Databases/DatabaseDictionary.cpp
@ -52,7 +52,7 @@ DatabaseDictionary::DatabaseDictionary(const String & name_, ContextPtr context_
 {
 }

-Tables DatabaseDictionary::listTables(const FilterByNameFunction & filter_by_name)
+Tables DatabaseDictionary::listTables(const FilterByNameFunction & filter_by_name) const
 {
    Tables tables;
    auto load_results = getContext()->getExternalDictionariesLoader().getLoadResults(filter_by_name);
@ -77,7 +77,7 @@ StoragePtr DatabaseDictionary::tryGetTable(const String & table_name, ContextPtr
    return createStorageDictionary(getDatabaseName(), load_result, getContext());
 }

-DatabaseTablesIteratorPtr DatabaseDictionary::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseDictionary::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name) const
 {
    return std::make_unique<DatabaseTablesSnapshotIterator>(listTables(filter_by_table_name), getDatabaseName());
 }
--- a/src/Databases/DatabaseDictionary.h
+++ b/src/Databases/DatabaseDictionary.h
@ -34,7 +34,7 @@ public:

    StoragePtr tryGetTable(const String & table_name, ContextPtr context) const override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    bool empty() const override;

@ -50,7 +50,7 @@ protected:
 private:
    Poco::Logger * log;

-    Tables listTables(const FilterByNameFunction & filter_by_name);
+    Tables listTables(const FilterByNameFunction & filter_by_name) const;
 };

 }
--- a/src/Databases/DatabaseLazy.cpp
+++ b/src/Databases/DatabaseLazy.cpp
@ -143,7 +143,7 @@ StoragePtr DatabaseLazy::tryGetTable(const String & table_name) const
    return loadTable(table_name);
 }

-DatabaseTablesIteratorPtr DatabaseLazy::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseLazy::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name) const
 {
    std::lock_guard lock(mutex);
    Strings filtered_tables;
@ -304,7 +304,7 @@ void DatabaseLazy::clearExpiredTables() const
 }


-DatabaseLazyIterator::DatabaseLazyIterator(DatabaseLazy & database_, Strings && table_names_)
+DatabaseLazyIterator::DatabaseLazyIterator(const DatabaseLazy & database_, Strings && table_names_)
    : IDatabaseTablesIterator(database_.database_name)
    , database(database_)
    , table_names(std::move(table_names_))
--- a/src/Databases/DatabaseLazy.h
+++ b/src/Databases/DatabaseLazy.h
@ -64,7 +64,7 @@ public:

    bool empty() const override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    void attachTable(const String & table_name, const StoragePtr & table, const String & relative_table_path) override;

@ -119,7 +119,7 @@ class DatabaseLazyIterator final : public IDatabaseTablesIterator
 {
 public:
    DatabaseLazyIterator(
-        DatabaseLazy & database_,
+        const DatabaseLazy & database_,
        Strings && table_names_);

    void next() override;
--- a/src/Databases/DatabaseOnDisk.h
+++ b/src/Databases/DatabaseOnDisk.h
@ -11,7 +11,6 @@ namespace DB
 {

 class Context;
-
 std::pair<String, StoragePtr> createTableFromAST(
    ASTCreateQuery ast_create_query,
    const String & database_name,
--- a/src/Databases/DatabasesCommon.cpp
+++ b/src/Databases/DatabasesCommon.cpp
@ -1,6 +1,7 @@
 #include <Databases/DatabasesCommon.h>
 #include <Interpreters/InterpreterCreateQuery.h>
 #include <Interpreters/Context.h>
+#include <Parsers/ASTCreateQuery.h>
 #include <Parsers/ParserCreateQuery.h>
 #include <Parsers/formatAST.h>
 #include <Storages/StorageDictionary.h>
@ -40,7 +41,7 @@ StoragePtr DatabaseWithOwnTablesBase::tryGetTable(const String & table_name, Con
    return {};
 }

-DatabaseTablesIteratorPtr DatabaseWithOwnTablesBase::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseWithOwnTablesBase::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name) const
 {
    std::lock_guard lock(mutex);
    if (!filter_by_table_name)
--- a/src/Databases/DatabasesCommon.h
+++ b/src/Databases/DatabasesCommon.h
@ -29,7 +29,7 @@ public:

    StoragePtr detachTable(const String & table_name) override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    void shutdown() override;

--- a/src/Databases/IDatabase.h
+++ b/src/Databases/IDatabase.h
@ -137,7 +137,7 @@ public:

    /// Get an iterator that allows you to pass through all the tables.
    /// It is possible to have "hidden" tables that are not visible when passing through, but are visible if you get them by name using the functions above.
-    virtual DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name = {}) = 0;
+    virtual DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name = {}) const = 0;

    /// Is the database empty.
    virtual bool empty() const = 0;
@ -240,6 +240,12 @@ public:
        throw Exception(getEngineName() + ": RENAME DATABASE is not supported", ErrorCodes::NOT_IMPLEMENTED);
    }

+    /// Whether the contained tables should be written to a backup.
+    virtual DatabaseTablesIteratorPtr getTablesIteratorForBackup(ContextPtr context) const
+    {
+        return getTablesIterator(context); /// By default we backup each table.
+    }
+
    /// Returns path for persistent data storage if the database supports it, empty string otherwise
    virtual String getDataPath() const { return {}; }

--- a/src/Databases/MySQL/DatabaseMaterializedMySQL.cpp
+++ b/src/Databases/MySQL/DatabaseMaterializedMySQL.cpp
@ -186,7 +186,7 @@ StoragePtr DatabaseMaterializedMySQL<Base>::tryGetTable(const String & name, Con

 template <typename Base>
 DatabaseTablesIteratorPtr
-DatabaseMaterializedMySQL<Base>::getTablesIterator(ContextPtr context_, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name)
+DatabaseMaterializedMySQL<Base>::getTablesIterator(ContextPtr context_, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) const
 {
    if (!MaterializedMySQLSyncThread::isMySQLSyncThread())
    {
--- a/src/Databases/MySQL/DatabaseMaterializedMySQL.h
+++ b/src/Databases/MySQL/DatabaseMaterializedMySQL.h
@ -61,7 +61,7 @@ public:

    StoragePtr tryGetTable(const String & name, ContextPtr context_) const override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context_, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context_, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) const override;

    void assertCalledFromSyncThreadOrDrop(const char * method) const;

--- a/src/Databases/MySQL/DatabaseMySQL.cpp
+++ b/src/Databases/MySQL/DatabaseMySQL.cpp
@ -84,7 +84,7 @@ bool DatabaseMySQL::empty() const
    return true;
 }

-DatabaseTablesIteratorPtr DatabaseMySQL::getTablesIterator(ContextPtr local_context, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseMySQL::getTablesIterator(ContextPtr local_context, const FilterByNameFunction & filter_by_table_name) const
 {
    Tables tables;
    std::lock_guard<std::mutex> lock(mutex);
--- a/src/Databases/MySQL/DatabaseMySQL.h
+++ b/src/Databases/MySQL/DatabaseMySQL.h
@ -57,7 +57,7 @@ public:

    bool empty() const override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    ASTPtr getCreateDatabaseQuery() const override;

--- a/src/Databases/PostgreSQL/DatabaseMaterializedPostgreSQL.cpp
+++ b/src/Databases/PostgreSQL/DatabaseMaterializedPostgreSQL.cpp
@ -203,7 +203,7 @@ void DatabaseMaterializedPostgreSQL::drop(ContextPtr local_context)


 DatabaseTablesIteratorPtr DatabaseMaterializedPostgreSQL::getTablesIterator(
-        ContextPtr local_context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name)
+    ContextPtr local_context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) const
 {
    /// Modify context into nested_context and pass query to Atomic database.
    return DatabaseAtomic::getTablesIterator(StorageMaterializedPostgreSQL::makeNestedTableContext(local_context), filter_by_table_name);
--- a/src/Databases/PostgreSQL/DatabaseMaterializedPostgreSQL.h
+++ b/src/Databases/PostgreSQL/DatabaseMaterializedPostgreSQL.h
@ -46,7 +46,7 @@ public:
    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach) override;

    DatabaseTablesIteratorPtr getTablesIterator(
-            ContextPtr context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) override;
+            ContextPtr context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) const override;

    StoragePtr tryGetTable(const String & name, ContextPtr context) const override;

--- a/src/Databases/PostgreSQL/DatabasePostgreSQL.cpp
+++ b/src/Databases/PostgreSQL/DatabasePostgreSQL.cpp
@ -88,7 +88,7 @@ bool DatabasePostgreSQL::empty() const
 }


-DatabaseTablesIteratorPtr DatabasePostgreSQL::getTablesIterator(ContextPtr local_context, const FilterByNameFunction & /* filter_by_table_name */)
+DatabaseTablesIteratorPtr DatabasePostgreSQL::getTablesIterator(ContextPtr local_context, const FilterByNameFunction & /* filter_by_table_name */) const
 {
    std::lock_guard<std::mutex> lock(mutex);

--- a/src/Databases/PostgreSQL/DatabasePostgreSQL.h
+++ b/src/Databases/PostgreSQL/DatabasePostgreSQL.h
@ -50,7 +50,7 @@ public:

    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach) override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    bool isTableExist(const String & name, ContextPtr context) const override;
    StoragePtr tryGetTable(const String & name, ContextPtr context) const override;
--- a/src/Databases/SQLite/DatabaseSQLite.cpp
+++ b/src/Databases/SQLite/DatabaseSQLite.cpp
@ -44,7 +44,7 @@ bool DatabaseSQLite::empty() const
 }


-DatabaseTablesIteratorPtr DatabaseSQLite::getTablesIterator(ContextPtr local_context, const IDatabase::FilterByNameFunction &)
+DatabaseTablesIteratorPtr DatabaseSQLite::getTablesIterator(ContextPtr local_context, const IDatabase::FilterByNameFunction &) const
 {
    std::lock_guard<std::mutex> lock(mutex);

--- a/src/Databases/SQLite/DatabaseSQLite.h
+++ b/src/Databases/SQLite/DatabaseSQLite.h
@ -34,7 +34,7 @@ public:

    StoragePtr tryGetTable(const String & name, ContextPtr context) const override;

-    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;

    bool empty() const override;

--- a/src/Dictionaries/ClickHouseDictionarySource.cpp
+++ b/src/Dictionaries/ClickHouseDictionarySource.cpp
@ -256,8 +256,8 @@ void registerDictionarySourceClickHouse(DictionarySourceFactory & factory)
        if (configuration.is_local)
        {
            /// Start local session in case when the dictionary is loaded in-process (without TCP communication).
-            local_session = std::make_shared<Session>(global_context, ClientInfo::Interface::TCP);
-            local_session->authenticate(configuration.user, configuration.password, Poco::Net::SocketAddress{"127.0.0.1", 0});
+            local_session = std::make_shared<Session>(global_context, ClientInfo::Interface::LOCAL);
+            local_session->authenticate(configuration.user, configuration.password, {});
            context = local_session->makeQueryContext();
            context->applySettingsChanges(readSettingsFromDictionaryConfig(config, config_prefix));
        }
--- a/src/Disks/S3/DiskS3.cpp
+++ b/src/Disks/S3/DiskS3.cpp
@ -6,25 +6,37 @@
 #include <bitset>
 #include <random>
 #include <utility>
-#include <IO/ReadBufferFromString.h>
-#include <Interpreters/Context.h>
-#include <IO/ReadBufferFromS3.h>
+
+#include <boost/algorithm/string.hpp>
+
+#include <common/unit.h>
+
+#include <Common/checkStackSize.h>
+#include <Common/createHardLink.h>
+#include <Common/quoteString.h>
+#include <Common/thread_local_rng.h>
+
 #include <Disks/ReadIndirectBufferFromRemoteFS.h>
 #include <Disks/WriteIndirectBufferFromRemoteFS.h>
+
+#include <Interpreters/Context.h>
+
+#include <IO/ReadBufferFromS3.h>
+#include <IO/ReadBufferFromString.h>
 #include <IO/ReadHelpers.h>
 #include <IO/SeekAvoidingReadBuffer.h>
 #include <IO/WriteBufferFromS3.h>
 #include <IO/WriteHelpers.h>
-#include <Common/createHardLink.h>
-#include <Common/quoteString.h>
-#include <Common/thread_local_rng.h>
-#include <Common/checkStackSize.h>
-#include <boost/algorithm/string.hpp>
+
 #include <aws/s3/model/CopyObjectRequest.h> // Y_IGNORE
 #include <aws/s3/model/DeleteObjectsRequest.h> // Y_IGNORE
 #include <aws/s3/model/GetObjectRequest.h> // Y_IGNORE
 #include <aws/s3/model/ListObjectsV2Request.h> // Y_IGNORE
 #include <aws/s3/model/HeadObjectRequest.h> // Y_IGNORE
+#include <aws/s3/model/CreateMultipartUploadRequest.h> // Y_IGNORE
+#include <aws/s3/model/CompleteMultipartUploadRequest.h> // Y_IGNORE
+#include <aws/s3/model/UploadPartCopyRequest.h> // Y_IGNORE
+#include <aws/s3/model/AbortMultipartUploadRequest.h> // Y_IGNORE


 namespace DB
@ -388,16 +400,7 @@ void DiskS3::saveSchemaVersion(const int & version)

 void DiskS3::updateObjectMetadata(const String & key, const ObjectMetadata & metadata)
 {
-    auto settings = current_settings.get();
-    Aws::S3::Model::CopyObjectRequest request;
-    request.SetCopySource(bucket + "/" + key);
-    request.SetBucket(bucket);
-    request.SetKey(key);
-    request.SetMetadata(metadata);
-    request.SetMetadataDirective(Aws::S3::Model::MetadataDirective::REPLACE);
-
-    auto outcome = settings->client->CopyObject(request);
-    throwIfError(outcome);
+    copyObjectImpl(bucket, key, bucket, key, std::nullopt, metadata);
 }

 void DiskS3::migrateFileToRestorableSchema(const String & path)
@ -553,18 +556,124 @@ void DiskS3::listObjects(const String & source_bucket, const String & source_pat
    } while (outcome.GetResult().GetIsTruncated());
 }

-void DiskS3::copyObject(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key) const
+void DiskS3::copyObject(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key,
+    std::optional<Aws::S3::Model::HeadObjectResult> head) const
+{
+    if (head && (head->GetContentLength() >= static_cast<Int64>(5_GiB)))
+        copyObjectMultipartImpl(src_bucket, src_key, dst_bucket, dst_key, head);
+    else
+        copyObjectImpl(src_bucket, src_key, dst_bucket, dst_key);
+}
+
+void DiskS3::copyObjectImpl(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key,
+    std::optional<Aws::S3::Model::HeadObjectResult> head,
+    std::optional<std::reference_wrapper<const ObjectMetadata>> metadata) const
 {
    auto settings = current_settings.get();
    Aws::S3::Model::CopyObjectRequest request;
    request.SetCopySource(src_bucket + "/" + src_key);
    request.SetBucket(dst_bucket);
    request.SetKey(dst_key);
+    if (metadata)
+    {
+        request.SetMetadata(*metadata);
+        request.SetMetadataDirective(Aws::S3::Model::MetadataDirective::REPLACE);
+    }

    auto outcome = settings->client->CopyObject(request);
+
+    if (!outcome.IsSuccess() && outcome.GetError().GetExceptionName() == "EntityTooLarge")
+    { // Can't come here with MinIO, MinIO allows single part upload for large objects.
+        copyObjectMultipartImpl(src_bucket, src_key, dst_bucket, dst_key, head, metadata);
+        return;
+    }
+
    throwIfError(outcome);
 }

+void DiskS3::copyObjectMultipartImpl(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key,
+    std::optional<Aws::S3::Model::HeadObjectResult> head,
+    std::optional<std::reference_wrapper<const ObjectMetadata>> metadata) const
+{
+    LOG_DEBUG(log, "Multipart copy upload has created. Src Bucket: {}, Src Key: {}, Dst Bucket: {}, Dst Key: {}, Metadata: {}",
+        src_bucket, src_key, dst_bucket, dst_key, metadata ? "REPLACE" : "NOT_SET");
+
+    auto settings = current_settings.get();
+
+    if (!head)
+        head = headObject(src_bucket, src_key);
+
+    size_t size = head->GetContentLength();
+
+    String multipart_upload_id;
+
+    {
+        Aws::S3::Model::CreateMultipartUploadRequest request;
+        request.SetBucket(dst_bucket);
+        request.SetKey(dst_key);
+        if (metadata)
+            request.SetMetadata(*metadata);
+
+        auto outcome = settings->client->CreateMultipartUpload(request);
+
+        throwIfError(outcome);
+
+        multipart_upload_id = outcome.GetResult().GetUploadId();
+    }
+
+    std::vector<String> part_tags;
+
+    size_t upload_part_size = settings->s3_min_upload_part_size;
+    for (size_t position = 0, part_number = 1; position < size; ++part_number, position += upload_part_size)
+    {
+        Aws::S3::Model::UploadPartCopyRequest part_request;
+        part_request.SetCopySource(src_bucket + "/" + src_key);
+        part_request.SetBucket(dst_bucket);
+        part_request.SetKey(dst_key);
+        part_request.SetUploadId(multipart_upload_id);
+        part_request.SetPartNumber(part_number);
+        part_request.SetCopySourceRange(fmt::format("bytes={}-{}", position, std::min(size, position + upload_part_size) - 1));
+
+        auto outcome = settings->client->UploadPartCopy(part_request);
+        if (!outcome.IsSuccess())
+        {
+            Aws::S3::Model::AbortMultipartUploadRequest abort_request;
+            abort_request.SetBucket(dst_bucket);
+            abort_request.SetKey(dst_key);
+            abort_request.SetUploadId(multipart_upload_id);
+            settings->client->AbortMultipartUpload(abort_request);
+            // In error case we throw exception later with first error from UploadPartCopy
+        }
+        throwIfError(outcome);
+
+        auto etag = outcome.GetResult().GetCopyPartResult().GetETag();
+        part_tags.push_back(etag);
+    }
+
+    {
+        Aws::S3::Model::CompleteMultipartUploadRequest req;
+        req.SetBucket(dst_bucket);
+        req.SetKey(dst_key);
+        req.SetUploadId(multipart_upload_id);
+
+        Aws::S3::Model::CompletedMultipartUpload multipart_upload;
+        for (size_t i = 0; i < part_tags.size(); ++i)
+        {
+            Aws::S3::Model::CompletedPart part;
+            multipart_upload.AddParts(part.WithETag(part_tags[i]).WithPartNumber(i + 1));
+        }
+
+        req.SetMultipartUpload(multipart_upload);
+
+        auto outcome = settings->client->CompleteMultipartUpload(req);
+
+        throwIfError(outcome);
+
+        LOG_DEBUG(log, "Multipart copy upload has completed. Src Bucket: {}, Src Key: {}, Dst Bucket: {}, Dst Key: {}, "
+            "Upload_id: {}, Parts: {}", src_bucket, src_key, dst_bucket, dst_key, multipart_upload_id, part_tags.size());
+    }
+}
+
 struct DiskS3::RestoreInformation
 {
    UInt64 revision = LATEST_REVISION;
@ -757,7 +866,7 @@ void DiskS3::processRestoreFiles(const String & source_bucket, const String & so

        /// Copy object if we restore to different bucket / path.
        if (bucket != source_bucket || remote_fs_root_path != source_path)
-            copyObject(source_bucket, key, bucket, remote_fs_root_path + relative_key);
+            copyObject(source_bucket, key, bucket, remote_fs_root_path + relative_key, head_result);

        metadata.addObject(relative_key, head_result.GetContentLength());
        metadata.save();
--- a/src/Disks/S3/DiskS3.h
+++ b/src/Disks/S3/DiskS3.h
@ -7,6 +7,7 @@
 #if USE_AWS_S3

 #include <atomic>
+#include <optional>
 #include <common/logger_useful.h>
 #include "Disks/DiskFactory.h"
 #include "Disks/Executor.h"
@ -131,7 +132,15 @@ private:

    Aws::S3::Model::HeadObjectResult headObject(const String & source_bucket, const String & key) const;
    void listObjects(const String & source_bucket, const String & source_path, std::function<bool(const Aws::S3::Model::ListObjectsV2Result &)> callback) const;
-    void copyObject(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key) const;
+    void copyObject(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key,
+        std::optional<Aws::S3::Model::HeadObjectResult> head = std::nullopt) const;
+
+    void copyObjectImpl(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key,
+        std::optional<Aws::S3::Model::HeadObjectResult> head = std::nullopt,
+        std::optional<std::reference_wrapper<const ObjectMetadata>> metadata = std::nullopt) const;
+    void copyObjectMultipartImpl(const String & src_bucket, const String & src_key, const String & dst_bucket, const String & dst_key,
+        std::optional<Aws::S3::Model::HeadObjectResult> head = std::nullopt,
+        std::optional<std::reference_wrapper<const ObjectMetadata>> metadata = std::nullopt) const;

    /// Restore S3 metadata files on file system.
    void restore();
--- a/src/Disks/TemporaryFileOnDisk.cpp
+++ b/src/Disks/TemporaryFileOnDisk.cpp
@ -0,0 +1,27 @@
+#include <Disks/TemporaryFileOnDisk.h>
+#include <Disks/IDisk.h>
+#include <Poco/TemporaryFile.h>
+
+
+namespace DB
+{
+
+TemporaryFileOnDisk::TemporaryFileOnDisk(const DiskPtr & disk_, const String & prefix_)
+    : disk(disk_)
+{
+    String dummy_prefix = "a/";
+    filepath = Poco::TemporaryFile::tempName(dummy_prefix);
+    dummy_prefix += "tmp";
+    assert(filepath.starts_with(dummy_prefix));
+    filepath.replace(0, dummy_prefix.length(), prefix_);
+}
+
+TemporaryFileOnDisk::~TemporaryFileOnDisk()
+{
+#if 1
+    if (disk && !filepath.empty())
+        disk->removeRecursive(filepath);
+#endif
+}
+
+}
--- a/src/Disks/TemporaryFileOnDisk.h
+++ b/src/Disks/TemporaryFileOnDisk.h
@ -0,0 +1,29 @@
+#pragma once
+
+#include <Core/Types.h>
+#include <memory>
+
+namespace DB
+{
+class IDisk;
+using DiskPtr = std::shared_ptr<IDisk>;
+
+/// This class helps with the handling of temporary files or directories.
+/// A unique name for the temporary file or directory is automatically chosen based on a specified prefix.
+/// Optionally can create a directory in the constructor.
+/// The destructor always removes the temporary file or directory with all contained files.
+class TemporaryFileOnDisk
+{
+public:
+    TemporaryFileOnDisk(const DiskPtr & disk_, const String & prefix_ = "tmp");
+    ~TemporaryFileOnDisk();
+
+    DiskPtr getDisk() const { return disk; }
+    const String & getPath() const { return filepath; }
+
+private:
+    DiskPtr disk;
+    String filepath;
+};
+
+}
--- a/src/Functions/Regexps.h
+++ b/src/Functions/Regexps.h
@ -61,7 +61,7 @@ namespace Regexps
    template <bool like, bool no_capture, bool case_insensitive = false>
    inline Pool::Pointer get(const std::string & pattern)
    {
-        /// C++11 has thread-safe function-local statics on most modern compilers.
+        /// C++11 has thread-safe function-local static on most modern compilers.
        static Pool known_regexps; /// Different variables for different pattern parameters.

        return known_regexps.get(pattern, [&pattern]
@ -257,7 +257,7 @@ namespace MultiRegexps
    template <bool save_indices, bool CompileForEditDistance>
    inline Regexps * get(const std::vector<StringRef> & patterns, std::optional<UInt32> edit_distance)
    {
-        /// C++11 has thread-safe function-local statics on most modern compilers.
+        /// C++11 has thread-safe function-local static on most modern compilers.
        static Pool known_regexps; /// Different variables for different pattern parameters.

        std::vector<String> str_patterns;
--- a/src/Functions/pointInPolygon.cpp
+++ b/src/Functions/pointInPolygon.cpp
@ -188,7 +188,7 @@ public:
            /// Preprocessing can be computationally heavy but dramatically speeds up matching.

            using Pool = ObjectPoolMap<PointInConstPolygonImpl, UInt128>;
-            /// C++11 has thread-safe function-local statics.
+            /// C++11 has thread-safe function-local static.
            static Pool known_polygons;

            auto factory = [&polygon]()
--- a/src/Functions/stringToH3.cpp
+++ b/src/Functions/stringToH3.cpp
@ -85,7 +85,7 @@ private:
        {
            auto h3index = h3index_source.getWhole();

-            // covert to std::string and get the c_str to have the delimiting \0 at the end.
+            // convert to std::string and get the c_str to have the delimiting \0 at the end.
            auto h3index_str = StringRef(h3index.data, h3index.size).toString();
            res_data[row_num] = stringToH3(h3index_str.c_str());

--- a/src/IO/ConcatReadBuffer.h
+++ b/src/IO/ConcatReadBuffer.h
@ -17,6 +17,7 @@ public:

 protected:
    ReadBuffers buffers;
+    bool own_buffers = false;
    ReadBuffers::iterator current;

    bool nextImpl() override
@ -61,7 +62,34 @@ public:
        assert(!buffers.empty());
    }

-    ConcatReadBuffer(ReadBuffer & buf1, ReadBuffer & buf2) : ConcatReadBuffer({&buf1, &buf2}) {}
+    ConcatReadBuffer(ReadBuffer & buf1, ReadBuffer & buf2) : ConcatReadBuffer(ReadBuffers{&buf1, &buf2}) {}
+
+    ConcatReadBuffer(std::vector<std::unique_ptr<ReadBuffer>> buffers_) : ReadBuffer(nullptr, 0)
+    {
+        own_buffers = true;
+        buffers.reserve(buffers_.size());
+        for (auto & buffer : buffers_)
+            buffers.emplace_back(buffer.release());
+        current = buffers.begin();
+    }
+
+    ConcatReadBuffer(std::unique_ptr<ReadBuffer> buf1, std::unique_ptr<ReadBuffer> buf2) : ReadBuffer(nullptr, 0)
+    {
+        own_buffers = true;
+        buffers.reserve(2);
+        buffers.emplace_back(buf1.release());
+        buffers.emplace_back(buf2.release());
+        current = buffers.begin();
+    }
+
+    ~ConcatReadBuffer() override
+    {
+        if (own_buffers)
+        {
+            for (auto * buffer : buffers)
+                delete buffer;
+        }
+    }
 };

 }
--- a/src/Interpreters/ClientInfo.h
+++ b/src/Interpreters/ClientInfo.h
@ -28,6 +28,8 @@ public:
        GRPC = 3,
        MYSQL = 4,
        POSTGRESQL = 5,
+        LOCAL = 6,
+        TCP_INTERSERVER = 7,
    };

    enum class HTTPMethod : uint8_t
--- a/src/Interpreters/Context.cpp
+++ b/src/Interpreters/Context.cpp
@ -46,6 +46,7 @@
 #include <Access/SettingsConstraintsAndProfileIDs.h>
 #include <Access/ExternalAuthenticators.h>
 #include <Access/GSSAcceptor.h>
+#include <Backups/BackupFactory.h>
 #include <Dictionaries/Embedded/GeoDictionariesLoader.h>
 #include <Interpreters/EmbeddedDictionaries.h>
 #include <Interpreters/ExternalDictionariesLoader.h>
@ -165,6 +166,8 @@ struct ContextSharedPart
    String tmp_path;                                        /// Path to the temporary files that occur when processing the request.
    mutable VolumePtr tmp_volume;                           /// Volume for the the temporary files that occur when processing the request.

+    mutable VolumePtr backups_volume;                       /// Volume for all the backups.
+
    mutable std::optional<EmbeddedDictionaries> embedded_dictionaries;    /// Metrica's dictionaries. Have lazy initialization.
    mutable std::optional<ExternalDictionariesLoader> external_dictionaries_loader;
    mutable std::optional<ExternalModelsLoader> external_models_loader;
@ -520,6 +523,35 @@ VolumePtr Context::setTemporaryStorage(const String & path, const String & polic
    return shared->tmp_volume;
 }

+void Context::setBackupsVolume(const String & path, const String & policy_name)
+{
+    std::lock_guard lock(shared->storage_policies_mutex);
+    if (policy_name.empty())
+    {
+        String path_with_separator = path;
+        if (!path_with_separator.ends_with('/'))
+            path_with_separator += '/';
+        auto disk = std::make_shared<DiskLocal>("_backups_default", path_with_separator, 0);
+        shared->backups_volume = std::make_shared<SingleDiskVolume>("_backups_default", disk, 0);
+    }
+    else
+    {
+        StoragePolicyPtr policy = getStoragePolicySelector(lock)->get(policy_name);
+        if (policy->getVolumes().size() != 1)
+             throw Exception("Policy " + policy_name + " is used for backups, such policy should have exactly one volume",
+                             ErrorCodes::NO_ELEMENTS_IN_CONFIG);
+        shared->backups_volume = policy->getVolume(0);
+    }
+
+    BackupFactory::instance().setBackupsVolume(shared->backups_volume);
+}
+
+VolumePtr Context::getBackupsVolume() const
+{
+    std::lock_guard lock(shared->storage_policies_mutex);
+    return shared->backups_volume;
+}
+
 void Context::setFlagsPath(const String & path)
 {
    auto lock = getLock();
--- a/src/Interpreters/Context.h
+++ b/src/Interpreters/Context.h
@ -340,6 +340,9 @@ public:

    VolumePtr setTemporaryStorage(const String & path, const String & policy_name = "");

+    void setBackupsVolume(const String & path, const String & policy_name = "");
+    VolumePtr getBackupsVolume() const;
+
    using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;

    /// Global application configuration settings.
--- a/src/Interpreters/InterpreterBackupQuery.cpp
+++ b/src/Interpreters/InterpreterBackupQuery.cpp
@ -0,0 +1,64 @@
+#include <Interpreters/InterpreterBackupQuery.h>
+#include <Backups/BackupFactory.h>
+#include <Backups/BackupSettings.h>
+#include <Backups/BackupUtils.h>
+#include <Backups/IBackup.h>
+#include <Backups/IBackupEntry.h>
+#include <Parsers/ASTSetQuery.h>
+#include <Interpreters/Context.h>
+
+
+namespace DB
+{
+namespace
+{
+    BackupSettings getBackupSettings(const ASTBackupQuery & query)
+    {
+        BackupSettings settings;
+        if (query.settings)
+            settings.applyChanges(query.settings->as<const ASTSetQuery &>().changes);
+        return settings;
+    }
+
+    BackupPtr getBaseBackup(const BackupSettings & settings)
+    {
+        const String & base_backup_name = settings.base_backup;
+        if (base_backup_name.empty())
+            return nullptr;
+        return BackupFactory::instance().openBackup(base_backup_name);
+    }
+
+    void executeBackup(const ASTBackupQuery & query, const ContextPtr & context)
+    {
+        auto settings = getBackupSettings(query);
+        auto base_backup = getBaseBackup(settings);
+
+        auto backup_entries = makeBackupEntries(query.elements, context);
+        UInt64 estimated_backup_size = estimateBackupSize(backup_entries, base_backup);
+
+        auto backup = BackupFactory::instance().createBackup(query.backup_name, estimated_backup_size, base_backup);
+        writeBackupEntries(backup, std::move(backup_entries), context->getSettingsRef().max_backup_threads);
+    }
+
+    void executeRestore(const ASTBackupQuery & query, ContextMutablePtr context)
+    {
+        auto settings = getBackupSettings(query);
+        auto base_backup = getBaseBackup(settings);
+
+        auto backup = BackupFactory::instance().openBackup(query.backup_name, base_backup);
+        auto restore_tasks = makeRestoreTasks(query.elements, context, backup);
+        executeRestoreTasks(std::move(restore_tasks), context->getSettingsRef().max_backup_threads);
+    }
+}
+
+BlockIO InterpreterBackupQuery::execute()
+{
+    const auto & query = query_ptr->as<const ASTBackupQuery &>();
+    if (query.kind == ASTBackupQuery::BACKUP)
+        executeBackup(query, context);
+    else if (query.kind == ASTBackupQuery::RESTORE)
+        executeRestore(query, context);
+    return {};
+}
+
+}
--- a/src/Interpreters/InterpreterBackupQuery.h
+++ b/src/Interpreters/InterpreterBackupQuery.h
@ -0,0 +1,20 @@
+#pragma once
+
+#include <Interpreters/IInterpreter.h>
+#include <Parsers/IAST_fwd.h>
+
+
+namespace DB
+{
+class InterpreterBackupQuery : public IInterpreter
+{
+public:
+    InterpreterBackupQuery(const ASTPtr & query_ptr_, ContextMutablePtr context_) : query_ptr(query_ptr_), context(context_) {}
+
+    BlockIO execute() override;
+
+private:
+    ASTPtr query_ptr;
+    ContextMutablePtr context;
+};
+}
--- a/src/Interpreters/InterpreterFactory.cpp
+++ b/src/Interpreters/InterpreterFactory.cpp
@ -1,4 +1,5 @@
 #include <Parsers/ASTAlterQuery.h>
+#include <Parsers/ASTBackupQuery.h>
 #include <Parsers/ASTCheckQuery.h>
 #include <Parsers/ASTCreateQuery.h>
 #include <Parsers/ASTCreateQuotaQuery.h>
@ -33,6 +34,7 @@

 #include <Interpreters/Context.h>
 #include <Interpreters/InterpreterAlterQuery.h>
+#include <Interpreters/InterpreterBackupQuery.h>
 #include <Interpreters/InterpreterCheckQuery.h>
 #include <Interpreters/InterpreterCreateQuery.h>
 #include <Interpreters/InterpreterCreateQuotaQuery.h>
@ -270,6 +272,10 @@ std::unique_ptr<IInterpreter> InterpreterFactory::get(ASTPtr & query, ContextMut
    {
        return std::make_unique<InterpreterExternalDDLQuery>(query, context);
    }
+    else if (query->as<ASTBackupQuery>())
+    {
+        return std::make_unique<InterpreterBackupQuery>(query, context);
+    }
    else
    {
        throw Exception("Unknown type of query: " + query->getID(), ErrorCodes::UNKNOWN_TYPE_OF_QUERY);
--- a/src/Interpreters/Session.cpp
+++ b/src/Interpreters/Session.cpp
@ -276,10 +276,14 @@ void Session::authenticate(const Credentials & credentials_, const Poco::Net::So
    if (session_context)
        throw Exception("If there is a session context it must be created after authentication", ErrorCodes::LOGICAL_ERROR);

-    user_id = global_context->getAccessControlManager().login(credentials_, address_.host());
+    auto address = address_;
+    if ((address == Poco::Net::SocketAddress{}) && (prepared_client_info->interface == ClientInfo::Interface::LOCAL))
+        address = Poco::Net::SocketAddress{"127.0.0.1", 0};
+
+    user_id = global_context->getAccessControlManager().login(credentials_, address.host());

    prepared_client_info->current_user = credentials_.getUserName();
-    prepared_client_info->current_address = address_;
+    prepared_client_info->current_address = address;

 #if defined(ARCADIA_BUILD)
    /// This is harmful field that is used only in foreign "Arcadia" build.
--- a/src/Parsers/ASTBackupQuery.cpp
+++ b/src/Parsers/ASTBackupQuery.cpp
@ -0,0 +1,130 @@
+#include <Parsers/ASTBackupQuery.h>
+#include <IO/Operators.h>
+#include <Common/quoteString.h>
+
+
+namespace DB
+{
+namespace
+{
+    using Kind = ASTBackupQuery::Kind;
+    using Element = ASTBackupQuery::Element;
+    using ElementType = ASTBackupQuery::ElementType;
+
+    void formatName(const DatabaseAndTableName & name, ElementType type, const IAST::FormatSettings & format)
+    {
+        switch (type)
+        {
+            case ElementType::TABLE: [[fallthrough]];
+            case ElementType::DICTIONARY:
+            {
+                format.ostr << " ";
+                if (!name.first.empty())
+                    format.ostr << backQuoteIfNeed(name.first) << ".";
+                format.ostr << backQuoteIfNeed(name.second);
+                break;
+            }
+            case ElementType::DATABASE:
+            {
+                format.ostr << " " << backQuoteIfNeed(name.first);
+                break;
+            }
+            case ElementType::TEMPORARY_TABLE:
+            {
+                format.ostr << " " << backQuoteIfNeed(name.second);
+                break;
+            }
+            default:
+                break;
+        }
+    }
+
+    void formatPartitions(const ASTs & partitions, const IAST::FormatSettings & format)
+    {
+        if (partitions.empty())
+            return;
+        format.ostr << (format.hilite ? IAST::hilite_keyword : "") << " " << ((partitions.size() == 1) ? "PARTITION" : "PARTITIONS") << " "
+                    << (format.hilite ? IAST::hilite_none : "");
+        bool need_comma = false;
+        for (const auto & partition : partitions)
+        {
+            if (std::exchange(need_comma, true))
+                format.ostr << ",";
+            format.ostr << " ";
+            partition->format(format);
+        }
+    }
+
+    void formatElement(const Element & element, Kind kind, const IAST::FormatSettings & format)
+    {
+        format.ostr << (format.hilite ? IAST::hilite_keyword : "") << " ";
+        switch (element.type)
+        {
+            case ElementType::TABLE: format.ostr << "TABLE"; break;
+            case ElementType::DICTIONARY: format.ostr << "DICTIONARY"; break;
+            case ElementType::DATABASE: format.ostr << "DATABASE"; break;
+            case ElementType::ALL_DATABASES: format.ostr << "ALL DATABASES"; break;
+            case ElementType::TEMPORARY_TABLE: format.ostr << "TEMPORARY TABLE"; break;
+            case ElementType::ALL_TEMPORARY_TABLES: format.ostr << "ALL TEMPORARY TABLES"; break;
+            case ElementType::EVERYTHING: format.ostr << "EVERYTHING"; break;
+        }
+        format.ostr << (format.hilite ? IAST::hilite_none : "");
+
+        formatName(element.name, element.type, format);
+
+        bool under_another_name = !element.new_name.first.empty() || !element.new_name.second.empty();
+        if (under_another_name)
+        {
+            format.ostr << (format.hilite ? IAST::hilite_keyword : "") << " " << ((kind == Kind::BACKUP) ? "AS" : "INTO")
+                        << (format.hilite ? IAST::hilite_none : "");
+            formatName(element.new_name, element.type, format);
+        }
+
+        formatPartitions(element.partitions, format);
+    }
+
+    void formatElements(const std::vector<Element> & elements, Kind kind, const IAST::FormatSettings & format)
+    {
+        bool need_comma = false;
+        for (const auto & element : elements)
+        {
+            if (std::exchange(need_comma, true))
+                format.ostr << ",";
+            formatElement(element, kind, format);
+        }
+    }
+
+    void formatSettings(const IAST & settings, const IAST::FormatSettings & format)
+    {
+        format.ostr << (format.hilite ? IAST::hilite_keyword : "") << " SETTINGS " << (format.hilite ? IAST::hilite_none : "");
+        settings.format(format);
+    }
+}
+
+String ASTBackupQuery::getID(char) const
+{
+    return (kind == Kind::BACKUP) ? "BackupQuery" : "RestoreQuery";
+}
+
+
+ASTPtr ASTBackupQuery::clone() const
+{
+    return std::make_shared<ASTBackupQuery>(*this);
+}
+
+
+void ASTBackupQuery::formatImpl(const FormatSettings & format, FormatState &, FormatStateStacked) const
+{
+    format.ostr << (format.hilite ? hilite_keyword : "") << ((kind == Kind::BACKUP) ? "BACKUP" : "RESTORE")
+                << (format.hilite ? hilite_none : "");
+
+    formatElements(elements, kind, format);
+
+    if (settings)
+        formatSettings(*settings, format);
+
+    format.ostr << (format.hilite ? hilite_keyword : "") << ((kind == Kind::BACKUP) ? " TO" : " FROM") << (format.hilite ? hilite_none : "");
+    format.ostr << " " << quoteString(backup_name);
+}
+
+}
--- a/src/Parsers/ASTBackupQuery.h
+++ b/src/Parsers/ASTBackupQuery.h
@ -0,0 +1,87 @@
+#pragma once
+
+#include <Parsers/IAST.h>
+
+
+namespace DB
+{
+using Strings = std::vector<String>;
+using DatabaseAndTableName = std::pair<String, String>;
+
+
+/** BACKUP { TABLE [db.]table_name [AS [db.]table_name_in_backup] [PARTITION[S] partition_expr [,...]] |
+  *          DICTIONARY [db.]dictionary_name [AS [db.]dictionary_name_in_backup] |
+  *          DATABASE database_name [AS database_name_in_backup] |
+  *          ALL DATABASES |
+  *          TEMPORARY TABLE table_name [AS table_name_in_backup]
+  *          ALL TEMPORARY TABLES |
+  *          EVERYTHING } [,...]
+  *        TO 'backup_name'
+  *        SETTINGS base_backup='base_backup_name'
+  *
+  * RESTORE { TABLE [db.]table_name_in_backup [INTO [db.]table_name] [PARTITION[S] partition_expr [,...]] |
+  *           DICTIONARY [db.]dictionary_name_in_backup [INTO [db.]dictionary_name] |
+  *           DATABASE database_name_in_backup [INTO database_name] |
+  *           ALL DATABASES |
+  *           TEMPORARY TABLE table_name_in_backup [INTO table_name] |
+  *           ALL TEMPORARY TABLES |
+  *           EVERYTHING } [,...]
+  *         FROM 'backup_name'
+  *
+  * Notes:
+  * RESTORE doesn't drop any data, it either creates a table or appends an existing table with restored data.
+  * This behaviour can cause data duplication.
+  * If appending isn't possible because the existing table has incompatible format then RESTORE will throw an exception.
+  *
+  * The "UNDER NAME" clause is useful to backup or restore under another name.
+  * For the BACKUP command this clause allows to set the name which an object will have inside the backup.
+  * And for the RESTORE command this clause allows to set the name which an object will have after RESTORE has finished.
+  *
+  * "ALL DATABASES" means all databases except the system database and the internal database containing temporary tables.
+  * "EVERYTHING" works exactly as "ALL DATABASES, ALL TEMPORARY TABLES"
+  *
+  * The "WITH BASE" clause allows to set a base backup. Only differences made after the base backup will be
+  * included in a newly created backup, so this option allows to make an incremental backup.
+  */
+class ASTBackupQuery : public IAST
+{
+public:
+    enum Kind
+    {
+        BACKUP,
+        RESTORE,
+    };
+    Kind kind = Kind::BACKUP;
+
+    enum ElementType
+    {
+        TABLE,
+        DICTIONARY,
+        DATABASE,
+        ALL_DATABASES,
+        TEMPORARY_TABLE,
+        ALL_TEMPORARY_TABLES,
+        EVERYTHING,
+    };
+
+    struct Element
+    {
+        ElementType type;
+        DatabaseAndTableName name;
+        DatabaseAndTableName new_name;
+        ASTs partitions;
+        std::set<String> except_list;
+    };
+
+    using Elements = std::vector<Element>;
+    Elements elements;
+
+    String backup_name;
+
+    ASTPtr settings;
+
+    String getID(char) const override;
+    ASTPtr clone() const override;
+    void formatImpl(const FormatSettings & format, FormatState &, FormatStateStacked) const override;
+};
+}
--- a/src/Parsers/ParserBackupQuery.cpp
+++ b/src/Parsers/ParserBackupQuery.cpp
@ -0,0 +1,204 @@
+#include <Parsers/ParserBackupQuery.h>
+#include <Parsers/ASTBackupQuery.h>
+#include <Parsers/ASTIdentifier.h>
+#include <Parsers/ASTLiteral.h>
+#include <Parsers/CommonParsers.h>
+#include <Parsers/ExpressionElementParsers.h>
+#include <Parsers/ExpressionListParsers.h>
+#include <Parsers/ParserPartition.h>
+#include <Parsers/ParserSetQuery.h>
+#include <Parsers/parseDatabaseAndTableName.h>
+
+
+namespace DB
+{
+
+namespace
+{
+    using Kind = ASTBackupQuery::Kind;
+    using Element = ASTBackupQuery::Element;
+    using ElementType = ASTBackupQuery::ElementType;
+
+    bool parseName(IParser::Pos & pos, Expected & expected, ElementType type, DatabaseAndTableName & name)
+    {
+        switch (type)
+        {
+            case ElementType::TABLE: [[fallthrough]];
+            case ElementType::DICTIONARY:
+            {
+                return parseDatabaseAndTableName(pos, expected, name.first, name.second);
+            }
+
+            case ElementType::DATABASE:
+            {
+                ASTPtr ast;
+                if (!ParserIdentifier{}.parse(pos, ast, expected))
+                    return false;
+                name.first = getIdentifierName(ast);
+                name.second.clear();
+                return true;
+            }
+
+            case ElementType::TEMPORARY_TABLE:
+            {
+                ASTPtr ast;
+                if (!ParserIdentifier{}.parse(pos, ast, expected))
+                    return false;
+                name.second = getIdentifierName(ast);
+                name.first.clear();
+                return true;
+            }
+
+            default:
+                return true;
+        }
+    }
+
+    bool parsePartitions(IParser::Pos & pos, Expected & expected, ASTs & partitions)
+    {
+        if (!ParserKeyword{"PARTITION"}.ignore(pos, expected) && !ParserKeyword{"PARTITIONS"}.ignore(pos, expected))
+            return false;
+
+        ASTs result;
+        auto parse_list_element = [&]
+        {
+            ASTPtr ast;
+            if (!ParserPartition{}.parse(pos, ast, expected))
+                return false;
+            result.emplace_back(ast);
+            return true;
+        };
+        if (!ParserList::parseUtil(pos, expected, parse_list_element, false))
+            return false;
+
+        partitions = std::move(result);
+        return true;
+    }
+
+    bool parseElement(IParser::Pos & pos, Expected & expected, Element & entry)
+    {
+        return IParserBase::wrapParseImpl(pos, [&]
+        {
+            ElementType type;
+            if (ParserKeyword{"TABLE"}.ignore(pos, expected))
+                type = ElementType::TABLE;
+            else if (ParserKeyword{"DICTIONARY"}.ignore(pos, expected))
+                type = ElementType::DICTIONARY;
+            else if (ParserKeyword{"DATABASE"}.ignore(pos, expected))
+                type = ElementType::DATABASE;
+            else if (ParserKeyword{"ALL DATABASES"}.ignore(pos, expected))
+                type = ElementType::ALL_DATABASES;
+            else if (ParserKeyword{"TEMPORARY TABLE"}.ignore(pos, expected))
+                type = ElementType::TEMPORARY_TABLE;
+            else if (ParserKeyword{"ALL TEMPORARY TABLES"}.ignore(pos, expected))
+                type = ElementType::ALL_TEMPORARY_TABLES;
+            else if (ParserKeyword{"EVERYTHING"}.ignore(pos, expected))
+                type = ElementType::EVERYTHING;
+            else
+                return false;
+
+            DatabaseAndTableName name;
+            if (!parseName(pos, expected, type, name))
+                return false;
+
+            ASTs partitions;
+            if (type == ElementType::TABLE)
+                parsePartitions(pos, expected, partitions);
+
+            DatabaseAndTableName new_name;
+            if (ParserKeyword{"AS"}.ignore(pos, expected) || ParserKeyword{"INTO"}.ignore(pos, expected))
+            {
+                if (!parseName(pos, expected, type, new_name))
+                    return false;
+            }
+
+            if ((type == ElementType::TABLE) && partitions.empty())
+                parsePartitions(pos, expected, partitions);
+
+            entry.type = type;
+            entry.name = std::move(name);
+            entry.new_name = std::move(new_name);
+            entry.partitions = std::move(partitions);
+            return true;
+        });
+    }
+
+    bool parseElements(IParser::Pos & pos, Expected & expected, std::vector<Element> & elements)
+    {
+        return IParserBase::wrapParseImpl(pos, [&]
+        {
+            std::vector<Element> result;
+
+            auto parse_element = [&]
+            {
+                Element element;
+                if (parseElement(pos, expected, element))
+                {
+                    result.emplace_back(std::move(element));
+                    return true;
+                }
+                return false;
+            };
+
+            if (!ParserList::parseUtil(pos, expected, parse_element, false))
+                return false;
+
+            elements = std::move(result);
+            return true;
+        });
+    }
+
+    bool parseSettings(IParser::Pos & pos, Expected & expected, ASTPtr & settings)
+    {
+        return IParserBase::wrapParseImpl(pos, [&]
+        {
+            if (!ParserKeyword{"SETTINGS"}.ignore(pos, expected))
+                return false;
+
+            ASTPtr result;
+            if (!ParserSetQuery{true}.parse(pos, result, expected))
+                return false;
+
+            settings = std::move(result);
+            return true;
+        });
+    }
+}
+
+
+bool ParserBackupQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
+{
+    Kind kind;
+    if (ParserKeyword{"BACKUP"}.ignore(pos, expected))
+        kind = Kind::BACKUP;
+    else if (ParserKeyword{"RESTORE"}.ignore(pos, expected))
+        kind = Kind::RESTORE;
+    else
+        return false;
+
+    std::vector<Element> elements;
+    if (!parseElements(pos, expected, elements))
+        return false;
+
+    if (!ParserKeyword{(kind == Kind::BACKUP) ? "TO" : "FROM"}.ignore(pos, expected))
+        return false;
+    ASTPtr ast;
+    if (!ParserStringLiteral{}.parse(pos, ast, expected))
+        return false;
+    String backup_name = ast->as<ASTLiteral &>().value.safeGet<String>();
+
+    ASTPtr settings;
+    parseSettings(pos, expected, settings);
+
+    auto query = std::make_shared<ASTBackupQuery>();
+    node = query;
+
+    query->kind = kind;
+    query->elements = std::move(elements);
+    query->backup_name = std::move(backup_name);
+    query->settings = std::move(settings);
+
+    return true;
+}
+
+}
--- a/src/Parsers/ParserBackupQuery.h
+++ b/src/Parsers/ParserBackupQuery.h
@ -0,0 +1,34 @@
+#pragma once
+
+#include <Parsers/IParserBase.h>
+
+
+namespace DB
+{
+/** Parses queries like
+  * BACKUP { TABLE [db.]table_name [AS [db.]table_name_in_backup] [PARTITION[S] partition_expr [,...]] |
+  *          DICTIONARY [db.]dictionary_name [AS [db.]dictionary_name_in_backup] |
+  *          DATABASE database_name [AS database_name_in_backup] |
+  *          ALL DATABASES |
+  *          TEMPORARY TABLE table_name [AS table_name_in_backup]
+  *          ALL TEMPORARY TABLES |
+  *          EVERYTHING } [,...]
+  *        TO 'backup_name'
+  *        [SETTINGS base_backup = 'base_backup_name']
+  *
+  * RESTORE { TABLE [db.]table_name_in_backup [INTO [db.]table_name] [PARTITION[S] partition_expr [,...]] |
+  *           DICTIONARY [db.]dictionary_name_in_backup [INTO [db.]dictionary_name] |
+  *           DATABASE database_name_in_backup [INTO database_name] |
+  *           ALL DATABASES |
+  *           TEMPORARY TABLE table_name_in_backup [INTO table_name] |
+  *           ALL TEMPORARY TABLES |
+  *           EVERYTHING } [,...]
+  *         FROM 'backup_name'
+  */
+class ParserBackupQuery : public IParserBase
+{
+protected:
+    const char * getName() const override { return "BACKUP or RESTORE query"; }
+    bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
+};
+}
--- a/src/Parsers/ParserQuery.cpp
+++ b/src/Parsers/ParserQuery.cpp
@ -1,4 +1,5 @@
 #include <Parsers/ParserAlterQuery.h>
+#include <Parsers/ParserBackupQuery.h>
 #include <Parsers/ParserCreateQuery.h>
 #include <Parsers/ParserCreateQuotaQuery.h>
 #include <Parsers/ParserCreateRoleQuery.h>
@ -40,6 +41,7 @@ bool ParserQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
    ParserGrantQuery grant_p;
    ParserSetRoleQuery set_role_p;
    ParserExternalDDLQuery external_ddl_p;
+    ParserBackupQuery backup_p;

    bool res = query_with_output_p.parse(pos, node, expected)
        || insert_p.parse(pos, node, expected)
@ -54,7 +56,8 @@ bool ParserQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
        || create_settings_profile_p.parse(pos, node, expected)
        || drop_access_entity_p.parse(pos, node, expected)
        || grant_p.parse(pos, node, expected)
-        || external_ddl_p.parse(pos, node, expected);
+        || external_ddl_p.parse(pos, node, expected)
+        || backup_p.parse(pos, node, expected);

    return res;
 }
--- a/src/Server/TCPHandler.cpp
+++ b/src/Server/TCPHandler.cpp
@ -979,6 +979,7 @@ void TCPHandler::receiveHello()
    is_interserver_mode = (user == USER_INTERSERVER_MARKER);
    if (is_interserver_mode)
    {
+        client_info.interface = ClientInfo::Interface::TCP_INTERSERVER;
        receiveClusterNameAndSalt();
        return;
    }
--- a/Show More
+++ b/Show More