imap-backup. It just extracts everything from imap server as mbox. Then that's rdiff-backup'ed to target disks. You can imap-backup it back to another IMAP serv

imap-backup. It just extracts everything from imap server as mbox. Then that's rdiff-backup'ed to target disks. You can imap-backup it back to another IMAP server if you need to. However it's better to just delete most stuff so you don't have to back it up. Think my mailbox is about 50Mb.