

Click ‘ Select Backup Disk…’ and choose the ‘ External Drive’.Select ‘ Open Time Machine preferences’ from the Time Machine menu in the menu bar at the top of your computer, or choose Apple menu > System Preferences, then click ‘ Time Machine’.Time Machine should ask to use your drive, if not, follow step 4 (below) to open Time Machine manually.

Connect the external hard drive to your Mac using the USB cable.Ensure your Mac is plugged into a power source.To back up your system in case of drive failure during encryption, follow these steps: Do not encrypt until you have backed up your computer! If you do not back up your computer and issues are encountered during the encryption process, you will risk losing your data.
