doveadm backup empties the remote host? SERIOUSLY???

Sure it's my own fault - no discussion about that, but seriously? How dangerously unintuitive it that?

I found it when I was searching for a good practice to migrate a mail server with rsync and I mistakably assumed it works in the same direction as rsync.

Luckily i have a backup from all mails except today's.

Please, someone tell me what's the best procedure to migrate dovecot.