If you can't back up or restore your Mac using Time Machine

If Time Machine states that it can't use your backup disk to back up or restore your files, try these solutions.

  • Make sure you're using a backup disk that's supported by Time Machine.
  • Unless you're using a network backup disk, make sure your backup disk is connected directly to your Mac, not through a USB hub or other device.
  • If your backup disk is connected directly to your Mac, use Disk Utility to repair the disk.
  • If you're using a network backup disk, make sure you have a good network connection and your Mac is connected to the same network as the backup disk. If you've previously completed a backup, verify it was successful by pressing and holding the Option key while choosing Verify Backups from the Time Machine menu in the menu bar.
  • Make sure the firmware of your backup disk is up to date. Check with the manufacturer of the backup disk for details.
  • If no other solutions work, start again: erase your backup disk, then use Time Machine to select it as your backup disk again. 

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