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31 GB to backup = 69,000,000 bytes?!

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timwkao

IS-IT--Management
Jun 7, 2004
24
US
Hi,

We have a Dell Powervault tape drive w/ 20/40 Tapes. I am not complaining about compression, because we usually get anywhere from 30-38GB on a tape.

My problem is that I backed up 3 directories containing a total of 31 GB of data. When we backed up those three directories, it took about 69Gb of tape space!

I am new to backups (I usually don't handle backups), but this just doesn't make sense.

I looked, and it has compression set to hardware if possible, otherwise software. In the log file, it said "Hardware Compression Enabled".

Is it because the files we are backing up might actually grow bigger in size when compressed? 90% of the files we are backing up are PDF (most) , Access, PST (fourth most), Word (third most)& Excel (second most) files.

Thanks in advance!

 
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