dovecot - Dec 2018 - Sieve scripts not backed up

(now from my subscribed account)

Hi all.
I try to backup out sieve scripts through
  doveadm  -o stats_writer_socket_path=  backup -R -u marc -N 
tcp:<remote.host>:4191

All mail is backed up but no scripts. What am I doing wrong ?

Thanks Marc

  doveconf -n

# 2.3.4 (0ecbaf23d): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 (60b0f48d)
# OS: Linux 4.4.0-137-generic x86_64 Ubuntu 16.04.5 LTS autofs
# Hostname: xxx
dict {
   acl = pgsql:/etc/dovecot/dovecot-dict-sql-local.conf.ext
}
doveadm_password = # hidden, use -P to show it
mail_debug = yes
mail_gid = vmail
mail_home = /home/mail/backup/%n
mail_location = maildir:/home/mail/backup/%n/mail
mail_uid = vmail
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 mime foreverypart extracttext
namespace Shared {
   location = 
maildir:/home/mail/backup/Common/mail:INDEXPVT=/home/mail/backup/%n/mail/common
   prefix = Shared/
   separator = /
   subscriptions = no
   type = public
}
namespace Users {
   list = children
   location = 
maildir:/home/mail/backup/%%n/mail:INDEXPVT=/home/mail/backup/%n/mail/shared/%%n
   prefix = Users/%%n/
   separator = /
   subscriptions = no
   type = shared
}
namespace inbox {
   inbox = yes
   location    mailbox Drafts {
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Trash {
     special_use = \Trash
   }
   prefix    separator = /
   type = private
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   acl = vfile
   acl_shared_dict = proxy::acl
   sieve = file:~/sieve;active=~/.dovecot.sieve
}
protocols = sieve
service auth {
   unix_listener auth-userdb {
     mode = 0777
   }
}
service dict {
   unix_listener dict {
     group = vmail
     user = vmail
   }
}
ssl = no
userdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}