I'm trying to set up a backup system from an Ubuntu server to a Synology NAS (DS413j) using rsync and sftp.

I have created a user for this that we can call ubuntu-backup. I have a directory in ubuntu-backup home directory called www where the backup will be saved. I have enabled Network Backup in DSM The user ubuntu-backup has full access to it's home directory

Here is my rsync config file on the Synology NAS:

#motd file = /etc/rsyncd.motd
#log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid
lock file = /var/run/rsync.lock
use chroot = no
[NetBackup]
path = /var/services/NetBackup
comment = Network Backup Share
uid = root
gid = root
read only = no
list = yes
charset = utf-8
auth users = root
secrets file = /etc/rsyncd.secrets

[ubuntu-backup]
path = /volume1/homes/ubuntu-backup/www
comment = Ubuntu Backup
uid = ubuntu-backup
gid = users
read only = false
auth users = ubuntu-backup
secrets file = /etc/rsyncd.secrets

The permissions on /volume1/homes/ubuntu-backup/www is ubuntu-backup:users 777

Here is the command i'm running.

rsync -aHvhiPb  /var/www/ [email protected]:./

The result:

sending incremental file list
ERROR: module is read only
rsync error: syntax or usage error (code 1) at main.c(1034) [Receiver=3.0.9]
rsync: connection unexpectedly closed (9 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at io.c(605) [sender=3.0.9]

If I'm running this:

rsync -aHvhiPb  /var/www/ [email protected]

It looks like its sending files. No errors. But I cant find anything on the NAS.