ny times: walmart's storage

"By its own count, Wal-Mart has 460 terabytes of data stored on Teradata mainframes, made by NCR, at its Bentonville headquarters. To put that in perspective, the Internet has less than half as much data, according to experts."

I don't know what "experts" the author was using as a source, but Google
alone has pedabytes "on the internet."

460 TB is a lot, but I would guess that most large companies have that much data (though typically not available to one set of systems).