Back up and restore your Mac
With a good backup system in place, you need never lose a file again
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HESE DAYS, BACKING up your computer is a essential. Whether you use your machine for work, leisure, entertainment, or something else, you don’t want to lose your precious files because of a drive failure, corruption, or accidental deletion. macOS has its own built–in app for backing up your Mac. Time Machine was introduced in 2007 with Mac OS X 10.5 Leopard. It creates incremental backups, which means the first time you use Time Machine, it copies everything on your Mac. After that, it only backs up files that are new or changed since the last backup.
It backs up automatically every hour, keeping hourly backups for the last 24 hours, daily backups for the past month, and weekly backups for everything older than that. When your backup volume runs out of space, it deletes the oldest backup to make room for the new.