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10.5: Reconnect Time Machine backup after drive swap
Authored by: only_solutions on Mar 10, '09 09:06:27PM

That is because OS X keeps a record of files which have been changed recently, but this record is not infinite.

Time Machine uses this record if it can — but when it suspects that the record does not contain all the changes made since the last backup it will do a "deep traversal", basically looking at every file on both disks and checking whether it needs to be backed up or not.

After you've made your copy, the change record on the copy was not deemed consistent and complete, so it took the long road on the first backup.

After that, however, Time Machine was back in sync and on the following backup it could use the change record which was much faster.

If you should have a long gap between subsequent backups, Time Machine may still revert back to deep traversal, but that is normal and will "fix" itself automatically when the backups are closer together again.

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