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10.5: Repair Time Machine after logic board changes
Authored by: palahala on Feb 09, '09 09:41:04AM

Not needed for this tip, but maybe helpful for troubleshooting: the content of the hidden .00f9e8d7c6b56 file on the backup drive should match the contents of the file /var/db/.TimeMachine.Cookie on the computer.

If not, then one will see:

/System/Library/CoreServices/backupd[12825]
  Backup destination mounted at path: /Volumes/TM
/System/Library/CoreServices/backupd[12825] 
  Volume at path /Volumes/TM does not appear to be the correct backup volume for this computer.  (Cookies do not match)
/System/Library/CoreServices/backupd[12825]
  Backup failed with error: 18

It seems that selecting another drive for Time Machine (through System Preferences) might change the timestamp and contents of /var/db/.TimeMachine.Cookie as well.



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10.5: Repair Time Machine after logic board changes
Authored by: krusty76 on Apr 12, '09 01:56:07AM

I wish I had seen this comment an hour ago. I missed one step of the process (renaming the sparse bundle) and so Time Machine attempted to create a completely new backup and failed due to limited space. When I corrected that, it seemed to start okay, but has been sitting here for a long time with no progress. Turns out, I think the previous failed update modified the cookie ... so it has to do some sort of "deep search". For hundreds of GB that could take a while (especially since I am doing it over WiFi).

Anyway, if anyone else messes up first, make sure you keep this part in mind before fixing any issues and moving on!



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