You can back up all your valuable data on Mac by using Time Machine. It’s a handy tool that comes with each Mac device by default for data maintenance, recovery, and backup. It will be useful if you need to bring back the files you lost after emptying the Trash or to be more efficient with your storage space.
To launch Time Machine backup, connect your hard drive disk to your MaBook and go to the Apple menu at the top of the screen. Go to System Preferences and find the Time Machine icon. Click on Select Backup Disk. A window will appear where you can select your external hard drive for backup.