offlineimap smart backup synchronization = bidirectional synchronization without deleting any messages

[proxym]

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 =)

2012/12/20 Edward Z. Yang <ezyang at mit.edu>:
> Excerpts from proxym's message of Wed Dec 19 11:32:13 +0800 2012:
>> 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.
>
> Note that OfflineIMAP will very quickly figure out what messages already
> exist on both ends (since the UIDs will match), so you will only pay for the delta.
>
> Edward
>
>> 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