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What is "back up memory" in the Storage tab of About This Mac. Why is it so big

Could someone expain the vetical bar graph in the storage tab of "About this Mac". I noticed that there is 53GB of backup... what is that? And how do I get rid of some of it to create more memory?

MacBook Air, OS X Mountain Lion (10.8.4)

Posted on Jul 9, 2013 4:36 PM

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What is "back up memory" in the Storage tab of About This Mac. Why is it so big

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