René Nyffenegger's collection of things on the web
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The size of data

1 PB: The Internet Archive Wayback Machine contains approximately 1 petabyte of data.
460 TB: By its own count, Wal-Mart has 460 terabytes of data stored on Teradata mainframes, made by NCR, at its Bentonville headquarters.
167 TB The surface web in 2002.
20 TB: The Internet Archive Wayback Machine grows at approximately 20 terabytes per month.