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 user at domain.tld \ ssh -c blowfish -i /tmp/vmail/.ssh/id_dsa vmail at 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