add(clickhouse): restore from a backup (#511)

docs/products/clickhouse/concepts/disaster-recovery.md

@@ -28,7 +28,7 @@ Also see [cross-availability-zone data distribution](/docs/platform/concepts/ava
 
 ## Backup and restore
 
-### Backups
+### Service backup
 
 Backups of Aiven for ClickHouse services happen automatically on a daily
 basis.
@@ -42,6 +42,9 @@ They cover the following:
 -   Table content (`part files`)
 -   Dictionaries
 
+You can
+[restore your service from a selected backup](/docs/products/clickhouse/howto/restore-backup).
+
 :::note[Part files]
 With the ClickHouse's ReplicatedMergeTree table engine, each INSERT
 query results in creating a new file, so-called part, written only once
@@ -52,16 +55,17 @@ only changed parts are backed up and files already available in the
 object storage are left out from the backup.
 :::
 
-### Recovery
-
-The restoration of a backup of an Aiven for ClickHouse service is
-performed on a running ClickHouse server and proceeds as a regular
-power-on of the service. The restoration happens only for powering up a
-service after powering it down or forking a service.
-
 For more information on backups in Aiven, see
 [Backups at Aiven](/docs/platform/concepts/service_backups).
 
+### Service recovery
+
+Regardless of whether your Aiven for ClickHouse service is powered on or powered off, you
+can create its copy and
+[restore the data from a selected service backup](/docs/products/clickhouse/howto/restore-backup).
+For this purpose, you create a fork from the original service. This spins up a new service
+that hosts the data recovered from the selected backup.
+
 ## Sharding
 
 Essentially, sharding is a technique of splitting database rows across

docs/products/clickhouse/howto/restore-backup.md

@@ -0,0 +1,24 @@
+---
+title: Fork and restore from Aiven for ClickHouse® backups
+sidebar_label: Fork & restore from backups
+---
+
+import ConsoleLabel from "@site/src/components/ConsoleIcons";
+
+Choose a service [backup](/docs/products/clickhouse/concepts/disaster-recovery#service-backup) to fork from and restore your Aiven for ClickHouse® service.
+
+1. Log in to the [Aiven Console](https://console.aiven.io) and go to your Aiven for
+   ClickHouse service.
+1. Click <ConsoleLabel name="backups"/> in the sidebar.
+1. Click **Fork & restore**.
+1. In the **New database fork** window, select the following:
+
+   - Backup to fork from
+   - Service name and a project
+   - Cloud provider and region
+   - Service plan and additional storage
+
+1. Click **Create fork**.
+
+Once the new fork service is running, you can set up your application's connection settings
+to point to this new fork service.

sidebars.ts

@@ -1227,6 +1227,7 @@ const sidebars: SidebarsConfig = {
                   label: 'Manage service',
                   items: [
                     'products/clickhouse/howto/secure-service',
+                    'products/clickhouse/howto/restore-backup',
                     'products/clickhouse/howto/manage-users-roles',
                     'products/clickhouse/howto/manage-databases-tables',
                     'products/clickhouse/howto/query-databases',