Backup Problem

[Mighty]

Folks,

I am trying to backup the C and D drive on my file server. My C drive is about 5GB and my D drive is about 40GB. I have a DAT72 tape drive with tapes that hold 36GB native and 72GB compressed. Should be fine.

However, when the backup is running, it gives a message saying that there is insufficient space on the tape and asks for another one. I am specifying that hardware compression is to be used. What is also weird is that it is giving the message after about 42GB of data has been backed up - doesn't seem to make any sense.

I have used different tapes so I know it's not a tape problem. Any ideas?

Mighty

 

[david817]

I have had that problem and a number of tapes will only go slightly over the 36 g mark. My guess is that a lot of files are as compressed as they are going to get but I could be wrong. I ended getting more backup drives. Dave

 

[cmeagan656]

It does depend on how much your files are already compressed. I've got 11 GB of native data which won't back up to DDS-3 tape (which should take 12 GB native/24 GB compressed) because it has already been compressed to 11 GB by Symantec's LiveState Autorecovery.

I've also got year-end financial statement software that compresses the data files to 20% - 25% of their original size on closing. I'm using NTBackup and they don't get compressed much more than another 1%, if that.

Cheers.