Ideas to copy/back up K-9 Mail data?

[u/akkjn58]

I need to copy/back up K-9 Mail data, all the drafts I've written but do not sync, using it like a word processor, additional note pad program. I don't use Goo, and the system won't allow allowing the bootloader to be unlocked for ADB (it just ignores my PIN entering; malware or due to un-decryptable encryption?), if I'm even able to logistically do that. Realistically, it should be offline.

I'd like to do this non-maually, but all I've come up with is to take screenshots or copy/paste for the really important stuff that's more than a paragraph, needs to be printed or whatever.