If you have existing HFS volumes, you won’t see them after you update, so you shouldn’t update any such volumes. With macOS Big Sur, you’ll need a drive formatted with APSF (Apple File System) to use Time Machine for backing up your files ( and you really should be backing up your files). (By the way, a Fusion Drive was a storage option on some iMac and Mac mini computers that combined a hard drive and flash storage in a single volume.) And no new Macs ship with a Fusion Drive.
Older Macs that use Fusion Drives or regular hard disk drives (HHDs) will not be converted.Īpple has promised APFS support for Fusion Drives, but, as best I can tell, this hasn’t happened yet. If you install APFS on any Mac that uses a solid-state drive (SSD) as a built-in boot drive, it will automatically convert to APFS and you will not have a choice. Fusion Drives and hard disk drives (HDDs) aren’t converted. You can’t opt-out of the transition to APFS. When you install macOS High Sierra and later on the built-in solid-state drive (SSD) of a Mac, that drive is automatically converted to APFS. APFS features strong encryption, space sharing, snapshots, fast directory sizing, and improved file system fundamentals. I’m guessing this will hold true when macOS Monterey is released. About APFSĪPFS is the default file system in macOS High Sierra and later for Macs with all-flash storage. Chances are your volume was HFS+, or some other incompatible format. If you’ve updated to Big Sur and notice that you no longer see one of your Time Machine volumes, it didn’t disappear.
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