docs/vmbackupmanager.md: run make docs-sync after c7d8dda39225b716ea44df7223db5e4a125d407b

docs/vmbackupmanager.md

@@ -154,6 +154,30 @@ The result on the GCS bucket. We see only 3 daily backups:
 
 ![daily](vmbackupmanager_rp_daily_2.png)
 
+### Protection backups against deletion by retention policy
+
+You can protect any backup against deletion by retention policy with the `vmbackupmanager backups lock` command.
+
+For instance:
+
+```console
+./vmbackupmanager backup lock daily/2021-02-13 -dst=<DST_PATH> -storageDataPath=/vmstorage-data -eula
+```
+
+After that the backup won't be deleted by retention policy.
+You can view the `locked` attribute in backup list:
+
+```console
+./vmbackupmanager backup list -dst=<DST_PATH> -storageDataPath=/vmstorage-data -eula
+```
+
+To remove protection, you can use the command `vmbackupmanager backups unlock`.
+
+For example:
+
+```console
+./vmbackupmanager backup unlock daily/2021-02-13 -dst=<DST_PATH> -storageDataPath=/vmstorage-data -eula
+```
 
 ## API methods
 
@@ -166,6 +190,22 @@ The result on the GCS bucket. We see only 3 daily backups:
   ```
   > Note: `created_at` field is in RFC3339 format.
 
+* GET `/api/v1/backups/<BACKUP_NAME>` - returns backup info by name.
+  Example output:
+  ```json
+  {"name":"daily/2023-04-07","size_bytes":318837,"size":"311.4ki","created_at":"2023-04-07T16:15:07+00:00","locked":true}
+  ```
+
+* PUT `/api/v1/backups/<BACKUP_NAME>` - update "locked" attribute for backup by name.
+  Example request body:
+  ```json
+  {"locked":true}
+  ```
+  Example response:
+  ```json
+  {"name":"daily/2023-04-07","size_bytes":318837,"size":"311.4ki","created_at":"2023-04-07T16:15:07+00:00", "locked": true}
+  ```
+
 * POST `/api/v1/restore` - saves backup name to restore when [performing restore](#restore-commands).
   Example request body:
   ```json
@@ -191,6 +231,12 @@ vmbackupmanager backup
   vmbackupmanager backup list 
     List backups in remote storage
 
+  vmbackupmanager backup lock
+    Locks backup in remote storage against deletion
+
+  vmbackupmanager backup unlock
+    Unlocks backup in remote storage for deletion
+
 vmbackupmanager restore
   Restore backup specified by restore mark if it exists