[Dovecot] 2.1.1: doveadm backup errors

[e-frog]

Hello Timo,

I'm experimenting with 'doveadm backup' on 2.1.1 (latest hg, full 
dovecot -n output attached) and haven't managed to get it working.

This is what I have done:
1. Create the directory /tmp/backup which is empty
2. Run  doveadm -v backup -u testuser at ubuntu-test.localdomain 
mdbox:/tmp/backup/

Then I see the following errors:

doveadm -v backup -u testuser at ubuntu-test.localdomain mdbox:/tmp/backup/
dsync(testuser at ubuntu-test.localdomain): Error: Can't delete mailbox 
INBOX: INBOX can't be deleted.
dsync(testuser at ubuntu-test.localdomain): Info: INBOX: only in dest 
(guid=9e4b88178b905f4f456e0000381555a6)
dsync(testuser at ubuntu-test.localdomain): Info: INBOX: only in source 
(guid=bd05451f2fbb574d40600000ec8d17cd)
dsync(testuser at ubuntu-test.localdomain): Error: Trying to open a 
non-listed mailbox with guid=9e4b88178b905f4f456e0000381555a6
dsync(testuser at ubuntu-test.localdomain): Error: msg iteration failed: 
Couldn't open mailbox 9e4b88178b905f4f456e0000381555a6
dsync(testuser at ubuntu-test.localdomain): Error: Trying to open a 
non-listed mailbox with guid=9e4b88178b905f4f456e0000381555a6
dsync(testuser at ubuntu-test.localdomain): Error: Mailbox INBOX changed 
its GUID (bd05451f2fbb574d40600000ec8d17cd -> 
9e4b88178b905f4f456e0000381555a6)
dsync(testuser at ubuntu-test.localdomain): Error: msg iteration failed: 
Couldn't open mailbox bd05451f2fbb574d40600000ec8d17cd
dsync(testuser at ubuntu-test.localdomain): Error: Mailbox INBOX changed 
its GUID (bd05451f2fbb574d40600000ec8d17cd -> 
9e4b88178b905f4f456e0000381555a6)

It somehow finds INBOX in destination however the backup directory is 
newly created and empty.

Thanks,
e-frog
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