Fix time machine after cloning your backup disk

So I’d swapped out my time machine hard drive for a new one. I superdupered the old backup onto the new disk, but time machine wouldn’t work. You get an error in the logs like:

“Cookie file is not readable or does not exist at path: /Volumes/backup/.0017f2cec48d ”

So what you need to do, is replace the cookie file. The bit to notice is that the number for the filename is your mac address:

“sudo cp /var/db/.TimeMachine.Cookie /Volumes/backup/. 0017f2cec48d”

in my case.

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2 Responses to “Fix time machine after cloning your backup disk”

  1. Peter Parker Says:

    Thank you so much for this valuable hint!
    You definitely made my day! :-)

  2. Thanks for the tip!

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