I don’t understand the suggestion you gave to @bllaxx.
This is what I’ve done and it works.
But, like I explain in that thread, the problem I have now is that as soon as I reboot the NAS, the rsync server config is gone. What should I do? Also, bear in mind that I don’t have the /etc/init.d/rsync present either and I’m using firmware 5.26.300 (OS 5 I guess).
My intention is to backup my Synology NAS using Hyperbackup on a WD My Cloud EX2 Ultra.
Forget all that. This is what I ended up doing.