
Time Machine will use up all the space on the drive to store the backups by default. If you are running macOS Big Sur or later, choose APFS as the format.

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If the drive you use for Time Machine backups is full, Time Machine will delete the oldest backups to make space. When Apple Time Machine is on, it saves hourly backups for the past day, and daily backups for the past month, and weekly backups for the data older than a month.

Here, you will know how to use Time Machine to back up and restore your Mac. It is reliable and easy to use, a solid choice for the majority of Mac users. Time Machine is Apple's solution for you. The best way to avoid data loss is to keep your Mac backed up so that you have a place to restore your Mac after an accidental deletion or system crash.
