When deleting from personal Backup, the message is not deleted from global Backup. All operations with the message remain available in global Backup.
You can delete messages from Backup one at a time, as a group, or all at the same time.
In personal user mode, you can delete messages from personal Backup if the administrator has enabled this option in personal Backup settings.
To delete a single message from the global or personal Backup:
The message is deleted from Backup.