It all depends on how much "alot" is, and how long you intend to keep this video stored for. If you're recording, lets say, 2 hours a day and you keep a months worth of video stored, on average 2 hours takes up about 1.5-2gb, depending on the format and compression rates. 2 hours could potentially take up twice that amount or more. But lets stick with 1hr=1gb. At this rate, you would be able to manage quite well with 6tb. 2x7=14gb x4 =56gb. Easily enough. However, something tells me you might be recording more. The best way to know is to do it, in all honesty. Decide for how long you want to keep a record for. Consider cloud storage as an option. Spend a week recording at the rate you plan on doing it at. After one week note the total...