offlineimap smart backup synchronization = bidirectional synchronization without deleting any messages

[proxym]

Looks like I must to create own patch =)
If I remove all from status folder I think it will be very very long
synchronisation then.
Looks like I must remove (from status folder) information about
message which was deleted from remote repository...

2012/12/19 Edward Z. Yang <ezyang at mit.edu>:
> Excerpts from proxym's message of Tue Dec 18 22:57:24 +0800 2012:
>> After I changed `no-delete-local` back to `no` ALL previously
>> not-deleted messages (because of `no-delete-local yes`) are deleted
>> from my local repository.
>> This patch IS TOO DANGEROUS in case of no back synchronisation of
>> messages to remote imap repository.
>
> Yes, what do you expect? OfflineIMAP sees that it's missing from the
> remote and not from the local, and syncs accordingly.  The same applies
> with maxage; if you unset it expect a lot of activity.
>
> One way to prevent OfflineIMAP from deleting anything is to remove
> your status folder; then OfflineIMAP assumes everything is "unsynced"
> and won't remove anything.
>
> Edward