I have currently a very elegant setup for surveillance, where 6 AXIS IP cameras are being recorded on a Synology DiskStation DS1513+.
I plan to install a further 2 IP cameras and what I need to do is this: Record all 8 cameras on the original DiskStation and at the same time have a second DiskStation (model indifferent) where I will record the feed ONLY from the newer 2 IP cameras.
If you have any experience with this kind of setup, I will appreciate your input.