docs: Update restore docs to include new rollback feature

modules/administration-guide/partials/assembly_backup-and-disaster-recovery.adoc

@@ -21,6 +21,12 @@
 * Backup snapshots are bound to their own specific cluster and must be used only there.
 ====
 
+{prod} Operator creates a new backup on every {prod-short} update.
+If a backup server is xref:define-backup-server-for-operator.adoc[configured], then it is used to store the backup.
+If no backup server configured, then internal backup server is used.
+If there is more than one backup server configured, the server with `che.eclipse.org/backup-before-update: true` annotation is used.
+If none have the annotation, then internal backup server is used.
+
 .Additional resources
 
 

modules/administration-guide/partials/proc_managing-backups-through-cli.adoc

@@ -34,18 +34,43 @@ $ {prod-cli} server:backup --repository-url=__<repository-url>__  --repository-p
 [id="cli-restoring-from-backup"]
 == Restoring from a backup
 
-. Recover the previous state of {prod-short}:
+. Recover to the previous state of {prod-short}:
 +
 [source,shell,subs="+quotes,+attributes"]
 ----
-$ {prod-cli} server:restore --repository-url=__<repository-url>__ --repository-password=__<repository-password>__
+$ {prod-cli} server:restore --repository-url=__<repository-url>__ --repository-password=__<repository-password>__ --snapshot-id=__<snapshot-id>__
 ----
 
-* The `server:restore` command can be run with no arguments when the backup server was used before.
+* It is possible to omit `--repository-url` and `--repository-password` arguments for the `server:restore` command if the same backup server should be used.
 
-. Recover from a specific snapshot by specifying its ID:
+. Recover to different than exiting version of {prod-short}:
 +
 [source,shell,subs="+quotes,+attributes"]
 ----
-$ {prod-cli} server:restore --snapshot-id=__<snapshot-id>__
+$ {prod-cli} server:restore --version=__<version>__ --snapshot-id=__<snapshot-id>__
+----
++
+[NOTE]
+====
+Provided snapshot must be created from the version of {prod-short} to which recover is requested.
+====
+
+* If you have a dedicated backup repository for each {prod-short} version and want to use the most recent backup for the version,
+you may provide `latest` as snapshot ID and it will be converted to the latest ID in the given repository.
+
+. Recover to the state described by an existing backup Custom Resource object:
++
+[source,shell,subs="+quotes,+attributes"]
+----
+$ {prod-cli} server:restore --backup-cr-name=__<CheClusterBackupCRName>__
+----
+
+. Recover to the previous version after update:
++
+{prod} automatically creates a backup when upgrading to a newer version.
+To return to the previous installed version run:
++
+[source,shell,subs="+quotes,+attributes"]
+----
+$ {prod-cli} server:restore --rollback
 ----

modules/administration-guide/partials/proc_managing-backups-through-custom-resources.adoc

@@ -9,7 +9,7 @@ include::partial$snip_internal-backup-server-warning.adoc[]
 
 * xref:setup-backup-server.adoc[Setting up a backup server].
 
-* xref:define-backup-server-for-operator.adoc[Configuring {prod-cli} to use the backup server].
+* xref:define-backup-server-for-operator.adoc[Configuring {prod} to use the backup server].
 
 .Procedure
 
@@ -65,6 +65,12 @@ spec:
 [id="operator-restoring-from-a-backup"]
 == Restoring from a backup
 
+[NOTE]
+====
+It is impossible to recover to a different version of {prod-short} using this approach.
+To do it, use `{prod-cli}` (see xref:managing-backups-using-cli.adoc#cli-restoring-from-backup[here]).
+====
+
 . Create a new object of `CheClusterRestore` to recover a {prod-short} installation from a backup:
 +
 [source,yaml,subs="+attributes"]