Nor does Apple have any reason to back-port that role type. In Big Sur, Apple added the Backup role, designed for Time Machine snapshots and incremental backups, and which is effectively unreadable in Catalina and earlier, because those releases simply don’t know how to interpret it. ![]() (In Catalina, Apple added volume groups, which are used to hold the operating system itself in pieces, separating your data from system files, enhancing system security and integrity.) You can have several volumes in a container that dynamically share the space allotted to the container, which means you don’t have to allocate storage space to a given volume beforehand. Each container has one or more volumes, and each volume (starting in High Sierra) has a “role,” whichĭefines the kind of volume it is. APFS divides a disk into one or more containers (similar to partitions). ![]() Not only must you use Big Sur to back up to an APFS-formatted Time Machine volume, you can’t even access the backups from a Mac with Catalina or an earlier macOS version installed. Select your external drive from the sidebar and click the Partition button. If you can't find it, press Cmd + Space to search for Disk Utility using Spotlight. ![]() Then go to Applications > Utilities and launch Disk Utility. This might go without saying, but I know enough people with mixed-system setups who will ask. Connect your external hard drive to your Mac. 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.
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