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Why are the files I've backed up smaller than the actual files?

For example, Aperture is 225 GB on my external drive but only 202 GB on the Time Machine backup.

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Does that hold for any file on the drive, or just some? Or only applications? How are you viewing the sizes of each application? Both through Finder? Or a terminal? –  slhck Oct 6 '12 at 23:22

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