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On Snow Leopard 10.6.8, TimeMachine keeps backing up the same files over and over again, as if they were not backed up the first time. As a result, each time I get a full backup of 300 GB!

I checked the Backups.backupdb folder tree and looked at "snapshots by date" (e.g. 2012-07-06-201030). What is strange is the files TimeMachine backs up have exactly the same MD5 checksum for each backup.

Any ideas?

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How are you looking at "snapshots by date" if just browsing in Finder then they will appear even if not backed up again – Mark Jan 8 '13 at 19:32
Can you post the console logs from backupd the next time Time Machine does a full backup without inheriting files from the previous one? – Kevin Chen Jan 9 '13 at 1:37

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