Time Machine is the built-in backup feature of your Mac, and it automatically backs up your personal and work data. We verify that Time Machine backups are running regularly (last 7 days) and that the disk is encrypted. Learn more on the Apple Support page.
Time Machine is an amazing feature. You can use it to find deleted files or fully restore your Mac if it got stolen, lost, or destroyed. You should keep it up-to-date so that you're able to restore the disk or find deleted files at any time. And you should have it encrypted so that the external disk is not readable (similar to FileVault).
A few minutes to configure it and a few hours for the first backup to finish.