...the system can detect and track moving objects as small as six inches from 20,000 feet in the air. But what’s most terrifying about ARGUS (fittingly named after Argus Panoptes, the 100-eyed giant of Greek myth) is what happens afterward: the system gives its owner (and eventually, DARPA says, a well-programmed A.I.) the ability to scan an entire city for all sorts of “suspicious” activity, not just in real-time but after the fact. It all adds up to around 6 petabytes (6,000 terabytes) worth of 12 frames-per-second video per day.
— The Verge