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Backup "New to Me" Mac

I bought a used 2017 iMac to replace my old 2007 iMac. I migrated the data from the old to the new just fine. The new mac still has the old users name as the device name. Now time machine will not recognize the disk I use for backing up and it tells me that I have not backed up in XXX days (I didn't backup the old mac regularly).


How can I fix this?


iMac 21.5" 4K, macOS 10.14

Posted on Jul 13, 2019 6:15 PM

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Question marked as Top-ranking reply

Posted on Jul 13, 2019 7:24 PM

Please read What to do before you sell, give away, or trade in your Mac - Apple Support.


The seller should have done all that prior to selling it. Since he or she did not, you will need to start with Step 6.

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Backup "New to Me" Mac

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