BACK UP OF ALREADY COMPRESSED FILES???

[ajna]

Thanks in advance to anyone who can help with this puzzling question i have...
I recently purchased a Quantum DLT 7000 and I am trying to backup a full 70gig HDD that contains .avi(divx) and .mp3 files to a DLTIV (40/80) cartridge using Veritas Backup Exec 8.5.
After several hours it manages to backup approx. 35gig of data and then promts me to insert another tape.

How does the software/hardware handle the compression algorithm with already compressed files?
I'm assuming that because i can only achieve the native 35gig capacity of 1 cartridge that the device can not compress these types of files any further to achieve 70gig compressed on a single cartridge???

 

[Zelandakh]

correct. 40/80 tapes mean 40 nominally uncompressed and 80 nominally compressed. Backing up compressed files means you'll only get a lot less than 80. Your situation sounds right. 35GB is all you get on the tape. Are you putting catalogues on tape or disk? If on tape that will take up a bit.