macOS High Sierra: You don’t have to upgrade to APFS

Macworld
Oct 4, 2017, 7:00 am965 pts
macOS High Sierra offers the new Apple File System (APFS) that replaces the old HFS+ filesystem. While you can upgrade your Mac to use APFS, it's not currently required. APFS offers a lot of advantages for SSD performance and durability, as well as encryption for any type of drive. But it’s not backwards…

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