Back up with Time Machine. Time Machine is the built-in backup feature of your Mac. It’s a complete backup solution, but you can use other backup methods as well.

How to Back Up Your Computer with Time Machine. Mac macOS (10.5 and above) has an excellent built-in backup tool called Time Machine. Once you plug in a hard drive and set up Time Machine, it will work automatically in the background, continuously saving

Check Back Up Automatically in the left pane of the dialog box if you want your Mac to back up at regular intervals. Check Show Time Machine in menu bar to create a shortcut in the menu bar to Time Machine preferences and backup status.