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I just started a TimeMachine backup after having only negligible changes to files on my HD (as far as I can tell). Yet the backup is shown to be of ~6GB (!!)

Is there some easy way for me to see which files make up those 6GB that TM is trying to back up?

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I found out that the space hogs were MobileSync backups of iDevices.... – GJ. Mar 8 '12 at 19:05
up vote 2 down vote accepted

You can use the GUI tool called TimeTracker (direct download link here):

TimeTracker is a quick-and-dirty application that displays the contents of your Time Machine backups, and shows what's changed since the previous backup

That should suffice to examine your backups.

On OS X 10.7, the tmutil command will probably let you do the same, albeit only through the command line. To compare your current OS X state and the latest backup, run:

tmutil compare

You can also compare two snapshots with each other, e.g. the latest two:

tmutil compare <path-to-snapshot> <path-to-snapshot>

… where the path to the snapshot is on your Time Machine volume, within the Backups.backupdb folder.

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An alternative to TimeTracker and tmutil is BackupLoupe. It has a nice graphical interface and helps you to find big differences by color-coding.

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… only that it costs $5 :) – slhck Feb 23 '12 at 15:45
He asked for an 'easy' tool not a free one. And sincerely 5$ is not the end of the world if it fits the needs. – Matteo Feb 23 '12 at 15:46
Yeah, absolutely. I have no problem with paying for software if it's useful. Just thought I'd mention it, as some people don't really like to spend money. – slhck Feb 23 '12 at 15:48
In any case: it is possible to download it and try it before paying ... – Matteo Feb 23 '12 at 15:49

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