Why does macbook air list 30 gigs of "backup" in storage and I can't find "backup" files?

I am trying to clear off my hard drive to take my 13 inch air (125 gb harddrive) and the "storage" dialog box says that more than 30 gigs of my HD is taken up by "backup."  What does this mean?  I can't find any files marked "backup."

OS X Mountain Lion: About local snapshots

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