[Dovecot] dovecot-2.2: dsync to imapc not working

[Evgeny Basov]

Hello.

I have dovecot installation

# dovecot --version
20130205 (03a0af22100d+)

built with imapc backend.

I'm tried to sync mailboxes from another server after clean mail
directory localy:

# dsync -v -o imapc_user="user at example.org" -o  imapc_password="pass" 
-o imapc_host=imap.example.org -o imapc_features=rfc822.size -o
mailbox_list_index=no  backup -R -f -u "user at example.org" imapc:

and get this message

dsync(user at example.org): Error: Exporting mailbox INBOX failed: Backend
doesn't support GUIDs, sync with header hashes instead

Repeated command returns this one message:

dsync(user at example.org): Error: Mailbox INBOX sync: mailbox_delete
failed: INBOX can't be deleted.

What wrong with this build?

Maybe there is another way to do it? For example create backup in local
temporary directory and synchronize this one and working storage.