Is there some app that can show me, based on my Time Machine backups or something, how my disk space is being used in comparison to a week ago? A week ago, I was using 150 gigs or so. Today, I'm using about 90. I have no idea where those 60 gigs of files disappeared to. Although I did install iTunes 11, which moved some things to the cloud, it wasn't 60 gigs worth. Thanks.