I have a hard drive recorder with quad inputs, motion detection, rs232 remote control (I wrote that bit) and use ebay dome cameras under the eaves.
The recorder is about £200 + hard drive, cameras about £30 each. It is possible to get a stand alone box to put the video onto the web, or dedicate a pc to it.
I have a friend who has bought a 4 input video surveillance card for his pc, but so far he's not managed to get it to work.
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