Hard Disc Backup

Setting up the external drive

This is only for a clone - Time Machine will do this automatically.

• Load Disk Utility.
• Select the external drive in the list.
• Click the partition tab and select the number you wish to create.
• Give each one a name (and size if there's to be more than one) and the format to APFS (Mac OS Extended (Journaled) for macOS pre-Catalina).
• Click the Options button and select the GUID partition scheme.
• Click the button to partition the drive.

External drive not new?

If your drive has been used before, the procedure is slightly different:

• Load Disk Utility.
• Select the partition in the list.
• Click First Aid and then Repair Disk

If Disk Utility finds errors and reports that they've been repaired, repeat Repair Disk until it reports that no repairs were necessary.