I have a Merit Lilin DVR recorder at home and 4 cameras around the outside. The DVR has 2 hard drives on constant record, once the disc(s) run out they start from scratch overwriting the old data, you get about 2 weeks worth of footage at 15 frames per second. Not mega expensive to buy, I can access the camera and control the DVR via the internet, view them on my house PC's and all TV's in the house!!!