Can’t select a drive to use with Time Machine? It might need reformatting
If you use Time Machine, you know that macOS asks you whenever you mount a new external drive whether or not you want to use it as another Time Machine destination. One of the backup service’s best features is that it can create archives on multiple volumes at once, and remembers backup volumes when they’re removed, so you can rotate through disks and keep one or more offsite.
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