dovecot - Nov 2015 - doveadm-backup verbosity?

Hi,

according to the man page doveadm-backup, the verbosity switch "-v" 
should do the following: "Enables verbosity, including progress
counter"

However, i see no difference running the following command with or 
without the "-v" switch:

 >>doveadm -v backup -R -A remote:myhost

The command itself works without problem, two mailboxes are correctly 
back-upped, but the output is only an empty line. Not sure if this is 
expected behavior.

Regards

# 2.2.19: /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.9 (357ac0a0e68b+)
# OS: Linux 4.2.5-1-ARCH x86_64
dsync_remote_cmd = ssh -p 19022 -l root %{host} doveadm dsync-server -u%u
first_valid_uid = 99
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date index ihave duplicate editheader
passdb {
   args = nopassword=y
   driver = static
}
plugin {
   sieve = file:~/sieve;active=~/.dovecot.sieve
   sieve_extensions = +editheader
}
protocols service anvil {
   process_min_avail = 0
   unix_listener anvil-auth-penalty {
     mode = 064
   }
}
ssl = no
userdb {
   args = /etc/dovecot/users
   default_fields = uid=nobody gid=nobody home=/backup/tmp/mail/%d/%n 
mail=sdbox:~/box
   driver = passwd-file
}