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

162 Views 1 Reply Latest reply: Jul 9, 2013 9:56 PM by shldr2thewheel RSS
fancythatqt Calculating status...
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Jul 9, 2013 4:36 PM

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)


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