I recently bought a new MacBook. It's running Yosemite and I managed to transfer my old user profile from the old computer via migration assistant.

Now I want to seamlessly continue my backup on the external USB HDD. But TM does not recognize that there's already a backup on the drive.

I was running osx 10.9 on the old computer. On the old computer, I was using a system partition and a data partition, on the new one I have only one partition. What can I do to continue my old backup?

  • When using Migration Assistant, you should have been prompted to specify whether you wanted the new Mac to inherit the old backup. – Flying Trashcan Nov 17 '14 at 14:43
  • Check out pondini.org/TM/B6.html for using tmutil to re-associate your new computer to your old Time Machine backup. The change in your partitioning will likely mean it will require a new backup of what used to reside on your old data partition if that was moved to your current single partition. – douggro Nov 17 '14 at 15:50
  • @flyingtrashcan: might be, but I can't remember whether it really asked – cukabeka Dec 19 '14 at 17:42
  • @duoggro: yes, that seems to have helped, although I had to restart the system more than once until it recognized the old backup. Until then, I was always prompted to create a completely new backup. – cukabeka Dec 19 '14 at 17:44

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