We are using Symantec Backup Exec 11d to backup our NAS box onto 1TB external hard drives. We currently have it setup to do the following:
1. Friday Afternoon - Do FULL backup of NAS box to 1TB external disk
2. Monday - Thursday Afternoon - Do DIFFERENCIAL backup of NAS box to 1TB external disk (same disk as full backup
3. Friday Afternoon - Swap External Hard Disk, repeat process
The poblem I am having is the full backup image is coming to 330GB, the differencial is coming to 120GB. The program has been told to manage its own space, but for some reason when I came in today the FULL Backup has been removed from the disk and only the differentials remained. Is there a way to make symantec delete the oldest differential if it need space?