dovecot - Jan 2022 - doveadm backup : Warning: Deleting mailbox GUID= is missing locally

> On 27. Jan 2022, at 16.27, Laura Smith <n5d9xq3ti233xiyif2vp at
protonmail.ch> wrote:
> 
> Hi,
> 
> As per the docs (https://wiki.dovecot.org/Tools/Doveadm/Sync) I'm
presently running doveadm backup multiple times with a view to eventual server
migration.
> 
> I am seeing messages such as this:
> Warning: Deleting mailbox 'Junk': UID=1826 GUID= is missing locally

this is probably a bug of some sort. Basically just means that Junk is resynced
completely and not just delta.
> 
> I also have a further question. It is not clear from the docs what the role
of the "-R" flag is in relation to "doveadm backup" ? 
Surely by definition backup = remote -> local ?
?R means reverse sync. Reverse direction.

Sami

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??????? Original Message ???????

On Thursday, January 27th, 2022 at 16:12, Sami Ketola <sami at ketola.io>
wrote:
> > On 27. Jan 2022, at 16.27, Laura Smith n5d9xq3ti233xiyif2vp at
protonmail.ch wrote:
> >
> > Hi,
> >
> > As per the docs (https://wiki.dovecot.org/Tools/Doveadm/Sync) I'm
presently running doveadm backup multiple times with a view to eventual server
migration.
> >
> > I am seeing messages such as this:
> >
> > Warning: Deleting mailbox 'Junk': UID=1826 GUID= is missing
locally
>
> this is probably a bug of some sort. Basically just means that Junk is
resynced completely and not just delta.

Great. Thanks you for clarifying.
>
> > I also have a further question. It is not clear from the docs what the
role of the "-R" flag is in relation to "doveadm backup" ?
Surely by definition backup = remote -> local ?
>
> ?R means reverse sync. Reverse direction.
>
So I should not be using "-R" with "doveadm backup" then ?

For "-R" the docs say "will instead pull messages from the remote
to the local storage."

for "backup" the docs say "doveadm backup performs one-way
synchronization"

That's where I'm confused.