![]() That changes in Big Sur, at least when you set up a new Time Machine volume. If there’s space left on the HFS+ volume that’s not being used by backups, you’re free to use it for other things. ![]() Time Machine creates a Backups.backupdb folder on the drive, and inside of that folder is a bunch of other folders: one each for each Mac you’re backing up to that drive, and then within those, one for every discrete backup each Mac has made.Įach of those backup folders appears to contain a full collection of every single file on your disk at the time, though in reality files that didn’t change between backups are hard linked so that you’re not wasting tons of space storing the same file over and over. In Catalina, you select an external volume connected via Thunderbolt or USB to use with Time Machine, and the partition is reformatted as an HFS+ volume whether you encrypt it or not is up to you. ![]() Further Reading A ZFS developer’s analysis of the good and bad in Apple’s new APFS file system
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