[Dalewyn]

I still use POP3 to this day because the very nature of the protocol means I keep local copies of all my emails.

It's still my responsibility to properly backup my local copy of the emails, of course, but that's easy.

[acidburnNSA]

I use IMAP to read emails, but back up emails by running tar in my server's /var/mail folder and scping the file to my backup drives.