[Dovecot] Use bacula to do backups/restores

Hi,

I'm already using Bacula for a lot of backups jobs and I also want do backup mail which is stored on a server. The mail is stored in Maildirs which a could backup at filesystem level. But when I restore such a backup strange things happen. My mail client show some mail double and most of the restored mails are unread. I think I'm missing some important IMAP things.

Martijn