When preparing an external Firewire or USB drive, the OS X default is to configure the drive to ignore permissions. If you then restore data from a ArGest Backup backup onto a drive configured in this manner, you will lose all ownership and permission information of the original files and folders when they are written to the external drive. To change this setting, select the drive on your desktop and choose “Get Info” from the popup menu.
If the volume settings are locked, click the security lock icon on the lower right and enter your user password. You will now be able to uncheck the “Ignore ownership on this volume” checkbox. This change will allow you to properly restore files to that drive while retaining any ownership, permissions, EAs, and ACL assignments.