Compression ratio varies even though amount/type of data stays the same
Running Backup Exec 12.5 on a Windows Server 2003.
I have had an issue where one nights backup compression ratio is 1.7:1, but the next night (exactly the same amount and type of data) it reduces to 1.6:1. This unfortunately causes a problem as it fills the tape when only compressing at 1.6:1.
Is there any explanation / solution for this? I cleaned the drive yesterday and still had the same yesterday evening, and the tapes are all fairly new, only 4 months old with approx 170hrs use.