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10.5: Repair Time Machine after logic board changes
Authored by: fygoat on Feb 01, '08 07:52:44PM

In my experience, however, following a logic board/MAC address change Time Machine will refuse to recognise the previous backups as belonging to the current system. After re-selecting the backup drive, it will just start a new backup set.

This hint allowed me to continue backing up in the same 'timeline' as the previous backup data. The only problem is that it seems to have forced a deep traversal and copied over most of the file system again.



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10.5: Repair Time Machine after logic board changes
Authored by: barrysharp on Feb 01, '08 09:52:58PM

Not so. It will recognise the earlier snapshots. Why would it not if the only association between the computer and TM is the MAC address. It simply does not make sense for it to be otherwise.

Have you verified using the TM browser that you cannot view or access the earlier snapshots - that is, the ones taken under the old MAC address ?

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Regards... Barry Sharp



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10.5: Repair Time Machine after logic board changes
Authored by: fygoat on Feb 02, '08 07:31:35AM

Yes, I've had the same problem quite a few times. Went through 3 replacement machines of identical configuration, each time Time Machine would initially report 'Backup Failed', saying it couldn't find the backup volume.

Re-selecting the backup drive would enable backups to proceed but Time Machine would create a new, separate backup instead of continuing on from the previous backup data.



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10.5: Repair Time Machine after logic board changes
Authored by: barrysharp on Feb 02, '08 11:59:54AM

Yep - I ran a few tests on this scenario and you're correct. I was not able to figure out just how to fake TM into continuing on from where it was. It does always make a new FULL backup. :( Bummer.

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Regards... Barry Sharp



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10.5: Repair Time Machine after logic board changes
Authored by: barrysharp on Feb 01, '08 09:58:35PM

TM will make a full backup if it cannot trust the backup volume's TM management data. I suspect if you used the HINT as posted here that what you did was insufficient to convince TM that things were as they should be. Hence TM will protect user by doing a full backup as a safety precaution.

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Regards... Barry Sharp



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