How to compare backups for changes?

[SteveR]

We are running 10 rev. 5520 on Windows 2003 Server.
Recently we have noticed that the total size of the backup is increasing daily by approximately 1GB and this has been happening for a week and is not stopping.
Is there some way to compare backups or perform some kind of an audit to find out what new data is being backed up each that that causes the backup to increase?

[Ken_Putnam]

Not useing BackupExec

But TREESIZE will let you save reports. You would have to manually compare, but the differences should be fairly obvious