After a few months, I finally came back to my problem and succeeded doing the following
-
enable SSH on the NAS
-
log as root welc0me
-
type the following commands
nano /etc/rsync.secrets
^O to save to disk, this file will be left empty, but the file needs to be there
^X to exit nano
nano /etc/rsyncd.conf
Type the following into the file
[shares]
the following path works fine. When you setup the backup task in the Synology, you will be able
to choose the desired WD share
path = /shares
uid = root
gid = root
read only = no
list = yes
auth users = all
secrets file = /etc/rsyncd.secrets
the IP address is the one of the Synology backing up to the WD. This provides some security.
hosts allow = 192.168.1.4/255.255.255.0
^O to save to disk
^X to exit nano
rsync --daemon
#for the Linux learners like me, that is 2 dash signs in front of daemon
Then go to the SYnology and set up a backup destination as a r-sync compatible server. Enter the IP address of the WD (better to have a fixed one). Enter root and welc0me as the user name and password. Pick the “shares” in the list of modules. Then create a backup task using this destination. At that point, you will be able to pick a WD share as the backup directory for all the Synology data.
Run your backup task.
To start rsync automatically on the WD reboot, do the following:
In /etc/init.d/rsync
change
RSYNC_ENABLE=false
to
RSYNC_ENABLE=true
Same thing for /etc/default/rsync
