Data Compression limit on Backup Tape
We use Backup Exec 10d Service Pack 4 and a Quantum Ultrium 2 LTO Backup Drive and compatible 200/400GB Ultrium 2 tapes and have hardware data compression enabled. We have successfully backed up 260GB on one tape overnight, however, more often than not, a further tape is requested to complete the backup usually around 220 -240GB, (this obvoiusly will have some disruption to the network use during the day).
When tapes advertise compression up to 400GB I am a little perplexed as to why I cannot alway complete the backup of 260GB, the files being backup up do not vary a great deal.
Thanks for any guidance on this topic