I’ve got one of these from ebay from same seller, but mines a 960H, this ones the replacement which is HD, and 1280 tv lines so even better…
http://www.ebay.co.uk/itm/720P-HD-4CH-Home-HDMI-DVR-1200TVL-IR-Surveillance-Security-Camera-CCTV-System-1T-/111673922591?hash=item1a0048d41f
Have it on the highest quality and it records 2 weeks worth, I can get 4 weeks if I lower it a tad, but 48 hours is the most i’ll ever need. Night vision is great too.
Can use the phone app to watch any of the cameras or all 4 at once from mobile. It can even send an email when motion detected and a snap of said detection.
Can be watched back from the DVR itself with a connected monitor/tv, or better done through the internet from comfort of PC @ desk.
It records 24 hours, and also records just motion detection, (you can also mark off areas so it doesnt pick up trees + wind etc) Great as you can watch back just the motion detection clips, and if you decide you want more footage around an event, you can watch the full day of footage too.
Setup is DVR box which has network cable and power to it, I used a homeplug to get the internet right next to it, and then x4 cameras with 60ft odd of cable per camera. Simply ran them down through the eaves, and used self amalgamating tape to seal the connectors just in case.
Quality of footage is excellent. Hardest part was setting up the gmail SMTP settings and port number, so overall an easy job.