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Help! Time Machine wants to overwrite its own backups after re-install Snow Leopard

134 Views 4 Replies Latest reply: Dec 3, 2012 2:27 PM by Mr Moto RSS
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Dec 3, 2012 1:59 AM

To make a long story short: I had to re-install Snow Leopard after the HD of my iMac was replaced, and for this, I had to use a CCC (Carbon Copy Cloner) copy instead of my Time Machine backup.

But now, as I want to continue working, Time Machine does not recognize its own backups on my external HD and wants to make an entirely new backup. I want it to keep using the old backups for incremantal backups. How do I do that?


iMac (27-inch Mid 2010), Mac OS X (10.6.8)
  • baltwo Level 9 Level 9 (59,150 points)

    See Pondini's TM FAQs, for starters.

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2
  • baltwo Level 9 Level 9 (59,150 points)

    OK. Rather than delve into all of your combinations, if you made a CCC bootable clone of what you had before getting the HD replaced, the simplest thing to do is boot with the clone, launch Disk Utility, wipe the new HD, and restore the clone. Ignore TM for the moment. Once your machine's running on the int HD exactly like it was before, then go an investigate the TM stuff. I don't use it, so Pondini's guide is the only thing I can point you to. Since your HD changed, so it comes with an universally unique ID (UUID)  and TM needs to redo the backup to reflect that, but the details are beyond my ken.

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2


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