When you have enabled access control on client data, the access control lists (ACLs) for the data are also included in the backup. When ACLs are included in backups, users can access only the files and folders for which they have access permissions. Other files and folders for which the users do not have permissions are filtered and hidden during find, browse, restore, and delete data operations.
For instructions about enabling access control, see Enabling ACLs during Backups.