OfflineIMAP for backups

["Mika Fischer" <mf+offlineimap@xxxxxxxxxx>]

Hi,

I would like to create a local backup of an IMAP account. While
OfflineIMAP can sync just fine I am a bit worried that an accidental
deletion of one or more mails in the backup might destroy the
originals as well.

I have not found a way to restrict OfflineIMAP to a one-way sync. Is
there a way? Or is there perhaps another tool which is better suited
for backups?

Thanks a lot,
 Mika