offlineimap smart backup synchronization = bidirectional synchronization without deleting any messages

[Edward Z. Yang]

Excerpts from proxym's message of Thu Dec 20 12:46:35 +0800 2012:
> Then the best solution for me is just a total removing of status
> folder (/home/username/.offlineimap) before every start of
> offlineimap, isn't it?
> 
> I can't believe that it is so simple =)

Well, after your status folder is initialized for the first time,
you shouldn't need to remove it again.

Edward