ait backup capacity

Hi - I am thinking about replacing a travan drive (wish i hadnt bothered with those they are so SSSLLLOOOOOOWWWWW!) i am looking at an ait 40/104gb drive, my question is how much data could i realistically expect to get on one of these, does anyone have any experience with this, i have read that you can expect anywhere from 0 to 40% extra above the native capacity but can anyone confirm this relating to these drives?
thanks in advance
andy
activateahsdAsked:
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
Why do you want tape for such a small amount of data?

And compression varies depending on the data YOU are backing up.  BAckup a text file that's 40 GB in size and contains nothing but the letter "a" over and over and you'll get FANTASTIC compression... backup a zip file, and you'll get between 1 and -1% compression (in most circumstances.

Might I suggest you read my backup comment - turned into a web page after I found myself posting it repeatedly here:
http://www.lwcomputing.com/tips/static/backup.asp
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activateahsdAuthor Commented:
very good advice - thanks...
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