offlineimap in backup mode

[Mathias Bertelsen <mathiasb@xxxxxxxx>]

Hello

I use offlineimap two places: one is where I backup an imap server by moving 
everything to another imap server. The other is where I backup an imap server 
by moving everything to a local Maildir structure.

At the moment these two ways run fine, but as i am nervous of loosing mail I 
wan't to hear, is it possible to run these two offlineimap tasks in some kind 
of 'backup-mode' where it only moves mail from one server and to the other 
(but not back), and it is not allowed to change anything on the main server?

-- 
Mvh.
 Mathias Bertelsen