This would require petabytes worth of storage.
4, 3megapixel high definition IP cameras require about 10 terabytes for a month's storage, 24/7, if they go to motion only after hours, they could cut that by 20% or so.
These systems would require at LEAST 8 cameras. 60 months, 10 terabytes a month is 1.2 petabytes. We'll call it 1 petabyte minimum storage if it's live. If you pull it off on tape, you're talking about a mountain of tapes to manage
There is simply no way to make this work. It's insane.
Ed
Zip those petabytes.
You will get one bit.
Save it.
May be 0, may be 1.
Let the feds unzip it. Or maybe Apple will help.