I am using NTBackup M,W,F(Diff) Sun(Normal) to backup our network. It backs up to a HD on the Backup Machine, the problem is that the Differental Backup has grown to 25gigs and we are running out of room on that HD. So my question to you is what can i do with that 25gig diff backup do i delete it? We have a 30gig tape backup should i back it up to that and then delete it, what is the proper way of accomplishing this task???