My question is this, I have a total of 5 tapes.. technically i should have six for this backup so i have a full backup on hand at all times. With the differential will Tuesday back-up everything different from the full (Friday) or will it back-up everything different from the monday differential. This is very important as i need to known when i restore do i restore the full back-up and the last differential or do i restore the full back-up and all differentials? Or is there a better method i should be using. I am using Veritas Backup Exec. 9.0.