How can I find exactly what files are included in my last Time Machine backup?

Solution 1:

You could try BackupLoupe: it will give you the size of each backup, the backed-up files and catalog the backups with colors to quickly identify the big ones.

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There are also lists of files excluded by rule or that you add manually to exclusions:

  • On OS X, what files are excluded by rule from a Time Machine backup?

Solution 2:

More recent app (10.9+) that does the trick: TimeTracker

Screen shot of TimeTracker analysis, sorted by size