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10.5: Reconnect Time Machine backup after drive swap
Authored by: only_solutions on Feb 20, '09 10:07:05PM
palahala: Aha, indeed it was not clear to me that you swapped the (source) disks in your Mac that uses Time Machine


palahala: Now that you explained about this UUID, I'd imagine that the content of /var/db/.TimeMachine.Cookie might somehow be related to the UUID of the drive that is the source for the backup.

That sounds plausible... It is probably used to detect the connection of the currently selected backup drive ("Change Disk" in Time Machine preferences probably re-sets it).

palahala: On the other hand, in the Unix world, I'd expect Time Machine to back up file systems that are actually located on multiple drives (like /home could be on some other drive than the other folders). If that were true then the UUID of a single partition should not matter. But given your hint, I assume that Time Machine in fact does rely on that UUID, and thus cannot create backups of file systems that use multiple drives...

Or at least not directly... especially when I think of FileVault I would expect that that is intentional. But since Time Machine is ultimately based on a souped-up version of rsync, maybe a closer look to its manual can give some information about that aspect.

And with the imminent introduction of ZFS the entire Time Machine mechanism may get a significant overhaul anyway.

palahala: Just for the record: the 10.5: Repair Time Machine after logic board changes hint was not mine; I just commented on it.

Yeah, I've just noticed that after posting. :-)

There are no problems...

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