The Internet Archive is a non-profit digital library with the stated mission of "universal access to all knowledge". It provides permanent storage of and free public access to collections of digitized materials, including websites, music, moving images, and nearly three million public-domain books. As of October 2012, its collection topped 10 petabytes. In addition to its archiving function, the Archive is an activist organization, advocating for a free and open Internet.
Description by Wikipedia