And then you can turn on encryption with: diskutil list # Figure out the device name of the "Backup" volume. You can then convert to APFS using the item in the "Edit" menu of the Disk Utility. Step 1: Plug in the external drive into Mac and make sure you can see the drive name in Finder’s sidebar. # - Use a GUID partition table.ĭiskutil eraseDisk JHFS+ Backup GPT disk2 Instead, you must format it from the command-line: # - Format as Journaled HFS+. However, the Disk Utility in macOS High Sierra provides no way to change the partition map scheme, even when you erase the disk. Turns out that was wrong and it is a legacy scheme the GUID partition map is the one you want. I had an external drive that I had formatted with the Apple Partition Map, mistakenly thinking it was the "best" format because the name suggested it was the one tailored to macOS. These are notes made while trying to set up APFS-to-APFS backups with SuperDuper!.
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