I would set up any new Time Machine volume formatted with APFS, but not convert an old one from HFS+.īig Sur APFS-based Time Machine backups can’t be used in Catalina or earlier releases. While APFS has advantages for SSD-based storage, there really aren’t any for hard disk drives, the most likely kind of drive used for large-capacity backup drives. Because of the structural differences, you can’t just copy from HFS+ to APFS, either. However, if you want to shift a drive from HFS+ to APFS, you have to reformat the drive, and that erases all the Time Machine backups. You can set up a drive from scratch with HFS+ to create new Time Machine volumes as well. Your old HFS+ based Time Machine volumes remain valid and readable in Big Sur. (Insert thinking face emoji here, for sure.) Apple created an exceedingly wacky way to encompass Time Machine’s snapshot format inside the APFS format, almost as if the company hadn’t developed both APFS and Time Machine. There’s no way to convert an HFS+ Time Machine volume to one that uses APFS without erasing it. But it took a full three releases from the first APFS appearance until Time Machine backups could be written to drives formatted with APFS: macOS 11.0 Big Sur is the first release to allow that.īut you format a Time Machine drive to APFS, there are a few things to consider. Fusion Drives followed with macOS 10.14 Mojave. In that release, all SSD-based Macs were upgraded to APFS. Apple started shifting Macs from its old HFS+ filesystem to its more sophisticated APFS format with macOS 10.13 High Sierra.
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