Doveadm backup...

[Sami Ketola]

> On 27. Mar 2022, at 23.09, John Stoffel <john at stoffel.org> wrote:
> 
>>>>>> "Stephane" == Stephane Magnier <steph.mag220 at netcourrier.com> writes:
> 
> Sorry, I deleted your most recent email post before I could reply.
> But why don't you just do 'imapsync' instead from your production
> dovecot box to some other backup system?  Otherwise I'd probably work
> to setup dovecot's own replication but only have it go one way.
> 
> For example, I've got a VPS out in the cloud for my email, and I
> should probably back it up to my home system using replication, but it
> would be strictly primary->secondary.  I wouldn't be trying to run two
> primaries replicating between each other.
> 
> Imapsync would be an improvement over rsync because it works within
> dovecot, so you'd get a more consistent view, but maybe not quite as
> upto date.  But how important is your email if you worry about losing
> 20 minutes worth of it?  If it's that critical, then you should be
> investing in a more robust setup.

I would not recommend using imapsync to do backups as it loses data.
There is no way for imapsync to retain all data as for example IMAP protocol 
does not allow client to set email UID numbers. Backup made with imapsync 
is always partial copy of the original and cannotbe restored identically.

Sami