Moreover, the best part of the time machine is that it can take a backup of everything present on your computer without any issues. As a result, it will be easier for you to restore all your data or a specific part of your data in case of data failure or drive crash. The app helps you to take a timely backup of your system. Even, the method is recommended by Apple itself. This built-in app is the easiest way to take backup on your Mac. You can find the app on by clicking on the Apple logo on the top left then go to System Preferences. 2.5 Step 5: Eject your external drive and unplug itĪpple computers come with a built-in app called Time Machine which allows you to take a backup of your system.2.4 Step 4: Wait for the backup to be completed.2.1 Step 1: Connect your external hard drive.2 How to Backup Mac to External Hard Drive?.