(9 January 2013) The Wayback Machine, with much more data and some code improvements, now covers late 1996 to December 9, 2012 according to a recent blog posting by Brewster Kahle. 
Even more incredible is that the Wayback Machine has gone from having 150,000,000,000 URLs to having 240,000,000,000 URLs, a total of about 5 petabytes of data. Over 500,000 people a day search the archive helping make archive.org the 250th most popular website according to Mr. Kahle. That’s understandable given that the Wayback Machine is sadly the only source for websites and pages that are no longer on the web. Read the full blog post here: http://blog.archive.org/2013/01/09/updated-wayback/ .
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