Existing Cameras – Need Recorder

I bought a home a few months back that has currently 12 cameras installed throughout the house. I have 30 ft ceilings in some places, and prefer to not rewire anything. All of the cables come together in a single closet.

I have examined the cameras and find no brand or logo on them, just CCD written on the side, which I now understand is not a brand but a feature.

How can I determine what Recorder I would need? I would prefer one that could handle motion sensing, link to cloud, internet or smartphone. I also have a synology server, that has some IP camera mgmt software. I think the first step is to buy a device that can receive images from the cameras. Please advise.