Alexey is right, but to explain what you have read... If you are backing up an endpoint to a VBR repository, you can make sure there is security on it, meaning that other users certainly can't reach to your backups and that YOU have the possibility to do recoveries. What we mean by losing rights is that you as a user won't be able to recover yourself from a backup copy job as that repository won't know who has rights or not... So it has nothing to do with the rights or permissions or whatever inside the guest.
Hope that makes it clear