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all data types have their spesific compression rate... if you use lto4 tapes for your backup it has 800 gb native / 1.6 Tb compressed capacity. backing up some nodes with files has approximately 1/2 compression rate you'll get 1,600,000.0 estimated capacity. But if this nodes got some files already compressed (like jpg,mpg,mp3,avi etc.) you'll get 800,000.0 estimated capacity. Or if you some nodes with files has higher compression rates you'll get 3,000,000.0 approx estimated capacity...