Backing up mailboxes in mail

[CubaTBird]

how do i backup my mail boxes in apple mail? nd once their backed up, how would i reimport them later?

 

[telecomm]

Go to mail help and search for backup, there's a mail help page that tells you which files to backup.

Fortunately I haven't had to reimport any of my backups, but I'd imagine it's just a matter of overwriting the relevant files. I wonder, though, whether this would overwrite any of the messages you'd received after the last backup? That might be a concern.