Apple lets you use Time Machine to create a backup from your Mac of all the data files, apps, and other stuff that’s not part of the macOS system installation. (Before macOS 11 Big Sur, you could back up system files, too, but now you reinstall the system.) It’s flexible enough to let you attach multiple volumes that Time Machine alternates using as targets for backups. You can also have a set of volumes that you swap between your
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