A 4TB external full size drive with it's own supply would be ideal here.
I think 4TB would be over kill. I was assuming 6GB/h per video camera, so with 3-4 camera units I think I get 12h of buffer with 256GB storage and 24h with 512GB storage. I do not think I need a week of video buffer that i would get with 4TB. It would just drive up the cost.
I said 4TB just because it's getting harder to find small, full-size externals. If you can find a smaller one then it would work fine as well.
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