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I added an SSD to my Mac mini and installed macOS Mojave on it. (it is already installed on the HDD) I notice that Time Machine is still backing up from the HDD. How can I change the source drive for Time Machine to the SSD?

  • it is going to back up your startup disk, I think. Are you booting from the SSD? – dwightk Jan 27 at 16:30
  • Sorry for late reply. As you can see from other comments I am booting from the SSD but it continues to backup from the HDD. – Fwelsh Feb 3 at 14:59
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  1. Open Time Machine preference
  2. Click Select Backup Disk
  3. Select your previous HDD disk

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  • Thank you, but that isn't the question. The problem is how to backup FROM the SSD, how to use the SSD as the source drive. I am backing up to a WD drive. to clarify: I have Mojave on the mini. I then added an SSD to the mini and installed Mojave on it. Cloned my stuff from the mini HDD to the SSD and now boot from the SSD. I expected Time Machine to backup from the SSD but it continues to backup from the mini HDD – Fwelsh Jan 22 at 19:59
  • Did you also erase your mini HDD? If so, you can use the mini HDD volume as Time machine target. – howdytom Jan 22 at 20:57
  • No. the HDD still has an entire Mojave system on it. I like to play safe :-) – Fwelsh Jan 23 at 12:21
  • I assume the only answer is to remove the system from the HDD? – Fwelsh Jan 25 at 15:16
  • Cloning a system drive does not automatically change any existing TM settings. If you want to change it you have to explicitly tell TM your a new target volume. There are plenty of options you can use. A) Backup your previous Mojave system to another hard disk B) Create a disk image from your Mojave system which can be copied back C) Depending on your previous HD disk size, you could also create 2 partitions e.g. TM-Backup and Mojave-Backup. – howdytom Jan 27 at 16:14

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