I am trying out a 4 camera security system for my small business, and I would like to get input from people who have tried the same. I basically require surveillance on the entrance, parking lot, storage room, and checkout point. I discovered a 4 channel CCTV system that looks like a suitable solution without having to spend much. Has anyone out there ever put up a small business camera system consisting of four cameras? I would also like to know whether four cameras are capable of giving good quality videos both during the day and night.