I setup a secure zone on my external USB drive. The apparent size of the drive was reduced so I assume the secure zone was set up properly. When I try to do a full backup of data from my system drive I don't see any option to backup to the secure zone when I select the destination. The backup then fails for lack of space. I assume that was caused by backing up to the small amount of free space rather than the secure zone. How do I direct the backup to the secure zone?