Backup Exec 10d, not compressing.

Recently upgraded Backup Exec 8.5 to 10d.  I primarily run two jobs in a given week.  M-Th are Differentials and Fridays are Full.  No backups run over the weekend.  The tape drive is a HP Surestore DLT 80G VSE80E.  We run 40/80 tapes through it.  Generally our Friday night backups are reaching 50GB, the setting is set to software compression, and there are no issues with this backup.  

The reason for the upgrade was because we've grown a lot in the last two years and needed remote agents on new servers.  One of the servers has about 150GB of archived data that needs to be backed up.  So the plan was to break that off in 50Gb chunks to three tapes.  Using the same settings, actually using every setting possible, the data will NOT compress.  I'm continually asked to put a new tape in, etc.  Backup Exec has the latest updates from Symantec, and the driver for the tape drive is also the most recent.  Any ideas?  

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You say "archived data". does that mean you have the data inside zipped archives? Whatever is zipped is already compressed and can't be compressed further. In some cases when you try compressing such data further, this will actually use up more space on the tape than when you don't try compressing further.
jwollAuthor Commented:
No, the data is not zipped or compressed at all.  90% of all the files are .TIF or .OCR files.
.tif files are normally compressed to a large extent too, like mp3, etc. With OCR I'm not sure, but also these files are likely to be compressed. You can compare the space they currently use and then add them to a zipped archive, that way you would see what compression is possible.

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HP claim that the Removable Storage Service can disable compression, so disable this service and see if it helps. You can also install L&TT to read the statistics off the tape drive rather than trusting what the backup software claims. Also L&TT can produced test data of a known compressability to test backups with, free download at
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