1. I am looking for backup solution for mdbox with SIS and experimenting with 
dsync.
I am planning to do it like that:
doveadm backup [deSISing] => transmitting to remote host => dsync-server 
[SISing]

Is there more convenient method?

2. I have dovecot 2.2.15 on both hosts. The local host is a mail server. 
Dovecot on the remote host neither running nor configured (I have created an 
empty dovecot.conf in the config dir).

When I tried to back up mailbox from local to remote host with command

doveadm backup -P -u u...@domain.tld \
ssh -c blowfish -i /tmp/vmail/.ssh/id_dsa vmail@remotehost \
doveadm \
-o mail_location=mdbox:/tmp/vmail/domain.tld/user/mdbox \
-o mail_attachment_dir=/tmp/vmail/attachments \
dsync-server

I got error messages:

dsync-remote(vmail): Error: Mailbox INBOX: Failed to set attribute 
vendor/vendor.dovecot/pvt/server/sieve/files/roundcube: Internal attributes 
cannot be changed directly
dsync-remote(vmail): Error: Mailbox INBOX: Failed to set attribute 
vendor/vendor.dovecot/pvt/server/sieve/files/main: Internal attributes cannot 
be changed directly
dsync-remote(vmail): Error: Mailbox INBOX: Failed to set attribute 
vendor/vendor.dovecot/pvt/server/sieve/files/test: Internal attributes cannot 
be changed directly
dsync-remote(vmail): Error: Mailbox INBOX: Failed to set attribute 
vendor/vendor.dovecot/pvt/server/sieve/default: Internal attributes cannot be 
changed directly

What do that errors mean? Does dsync try to replicate sieve scripts?

--
Alexander

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