[Dovecot] dsync backup doubles quota

[Patrick Westenberg]

Hi everyone,

I recognized a very strange behavior when doing backups of my mdbox 
mailboxes. After the backup the quota for each mailbox is twice as much
as before the backup and I have to recalculate the quota to get the
former/correct information.

root at mb01:~# doveadm quota get -u test at example.com
User quota STORAGE   5 10240
User quota MESSAGE   11    -

root at mb01:~# doveadm backup -u test at example.com mdbox:/home/example.com/test

root at mb01:~# doveadm quota get -u test at example.com
User quota STORAGE    10 10240
User quota MESSAGE    22  -

root at mb01:~# doveadm quota get -u test at example.com

root at mb01:~# doveadm quota get -u test at example.com
User quota STORAGE     5 10240
User quota MESSAGE    11   -

Is this a bug or normal behavior?

Regards
Patrick