

You need a backup of Projects and Untitled because you will be deleting them.

The backup of Macintosh HD is in case of mistakes/disasters. The volumes will all share the 500GB disk, but will not be restricted to particular sizes like your 350GB, 75GB and 75GB.īefore you do anything with your disk structure make sure you have a good backup of everything you need to keep. The container can then have multiple volumes - in your case: Macintosh HD and Projects. I recommend having one partition which is formatted as an APFS container.

In what follows I assume you want all the files in all three existing partitions. Firstly, you don't need to have separate partitions.
