Keep in mind, if you are writing VBR’s backup files to tape – compression might be enabled in the source backup jobs.
I should have probably clarified. I'm using the "File to Tape Backup" feature.
I don't have an LTO-4 drive hooked up to the production Backup Exec server but it does have an LTO-5 made by the same manufacture (Quantum). LTO-5 capacity is 1500gb / 3000gb (uncompressed / compressed). Looking at the tape backup history on BE, I can see that BE is getting around 1570gb on one tape with compression enabled. I know I should hook up the LTO-4 to do a 1:1 test between BE and Veeam but this is what I have available at the moment.
Is there any way to confirm that the data on the tape is indeed getting compressed? Even with EOM commands from the drive, one should expect to get closer if not a tad over capacity using compression like we are seeing with BE.