Learn how to export you mailboxes from the Mail app on the Mac.
Did you know that you could backup your individual mailboxes by exporting them from the Mail app? All you need to do is select which mailboxes you would like to export, and under Mailbox in the menu bar, select Export Mailbox. See how to export you mailboxes from the Mail app on the Mac in this video.
Video Transcript (video also has closed captions):