How would the backup data be deleted in the same fashion? Don't you think it be dumb if they have the backup and the main storage hook up in the same system? If something would to happen to anyone char in the main storage it still be in the backup files.
Yoshi-p himself said there taking good care of anyone data and making sure the both the main and backup don't have issue. So if something did happen to your main it would still be in the backup files save. If there smart they would not even have the backup hook up to anything to it's needed for something.