I don't really get the point of hacking a synology to break this kind of protection. I understand why you'd take one so that you get everything setup for you, but if you're gonna invest time jailbreaking and hacking it, wouldn't you be better off using an old PC with your own linux/software setup as a server?

Actually easier to remove the license restrictions around their RTSP backup software than it is to set up an equivalent thing myself

(Edit: I have a very particular set of skills. Having put some time into making this work with tools I could put together myself and failing, I found that my Synology had a tool that did it perfectly and refused to do so for the number of cameras I had. I fixed that.)