We are installing digital video systems in about 75 commercial banks. We build our computers, and install a video card (usually Geovision). Most installations are usually 9 color cameras. We use the 30fps cards, and install 3, 120gb hard drives. We also install a CDRW unit, a 19" monitor in the lobby area, and a 15" monitor for setup at the computer location. What we do NOT have is a backup system. The system usually records about 2gb per day, 5 days a week, using (smart) motion only recording. We would greatly appreciate any input that you might have as to what types of backup system we might consider. Thank you very much. Robert