1) If it's your own country's traffic, at the choke point in the network, which you (ie. govt) have full control over, since they are domestic. 2) Since you al

1) If it's your own country's traffic, at the choke point in the network, which you (ie. govt) have full control over, since they are domestic. 2) Since you already have 100,000 disks, run 5000 of them in parallel. Each disk interface does 200MB/s, for an aggregate of 1TB/s. If necessary, use fibre to transport data from the collection point to the storage point. 3) Don't. Record the lot. 4) Spend a billion on a super computer? I think it comes down to the bandwidth of computers now vastly exceeding the bandwidth of human thought. It is now possible to record an person's entire life, with plenty of headroom to spare, to account for any attempt to overwhelm the recording system.