If you’re using AFP to share a Mac drive, It’s time to change
You may need to tweak some settings to keep sharing volumes after upgrading to High Sierra or later.
Mac 911
Dec 17, 2020 9:00 pm PST
IDG
Apple began phasing in the use of its SSD-friendly APFS file system with High Sierra for SSD-only Macs, and then upgraded Fusion Drive-based Macs in Mojave. In Big Sur, Time Machine volumes can finally be formatted with APFS, too. But in this transition, one capability was quietly lost: APFS volumes cannot be shared for network access via Apple’s relatively ancient Apple Filing Protocol (AFP).