IP Camera NVR recommendation (or SAN or NAS)

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I'm looking for a better solution to recording my cheap, IP Camera videos - an NVR that only records on motion events, triggered by the cameras -- so im not throwing data constantly across the switch.

 

I have a 9 cameras of various makes:

 

-- ELP-720P IP Cameras [https://www.amazon.com/ELP-720P-Night-Camera-Network/dp/B00KA4QCKI]

-- WestMile Model 301792997785

-- GeoVision

 

Problem is they ALL record CONSTANTLY ...

The ELP Cameras let you set up motion detection area, but I dont know how to get this to do anything other than email me a still from the camera.

 

I would like -- preferable a dedicated NVR or Linux based machine ... to record only on a camera triggering a motion event... and record video... on the NVR or a fileserver of sorts.

 

Any recommendations on:

 

1) NvR's or software for a linux (or even windows) machine that isn't going to suck too much power (power = heat = expensive to operate)

2) on setting up the ELP and WestMile cameras? (custom firmware?, better way to set them up? Am I doing it incorrectly?)

3) Possibly better or alternative Camera brands that would do this better, that arent ultra expensive?