[Dovecot] Backing up mail?

My mail server is running on a Fedora FC5 box. I need to move the mail server to another computer and so I need to back up my user's mail and move it. I have found mail in /var/spoo/mail/[users] and in their home directories there is a 'mail' directory. All users have an 'Inbox' file that is empty and I think the one IMAP user has a 'Trash' file that is huge!

Are those the only files I need to copy or are there others lurking out there that I don't know about?

Thanks,

-- Knute Johnson Molon Labe...