This way whenever you plug in your WD Elements drive, your Mac will start a Time Machine backup. And also check the box to show Time Machine in the menu bar at the top of your Mac’s Desktop screen. This makes life so much easier later when you want to c

To see the size of a specific file or folder, click it once and then press Command-I. To see storage information about your Mac, click the Apple menu in the top-left of your screen. Choose About This Mac and click the Storage tab. For Time Machine backups

Whichever method is your favorite, you shouldn’t rely on a single backup for your Mac. Backing up to an external hard drive and to an online backup service keeps your data safe, whatever happens ...