Two common techniques for archiving web sites are using a web crawler or soliciting user submissions:
On February 12, 2001, Google acquired the usenet discussion group archives from Deja.com and turned it into their Google Groups service. They allow users to search old discussions with Google's search technology, while still allowing users to post to the mailing lists.
The Internet Archive is building a compendium of websites and digital media. Starting in 1996, the Archive has been employing a web crawler to build up their database. It is one of the best known archive sites.
NBCUniversal Archives offer access to exclusive content from NBCUniversal and its subsidiaries. Their NBCUniversal Archives website provides easy viewing of past and recent news clips, and it is a prime example of a news archive.
PANDORA (Pandora Archive), founded in 1996 by the National Library of Australia, stands for Preserving and Accessing Networked Documentary Resources of Australia, which encapsulates their mission. They provide a long-term catalog of select online publications and web sites authored by Australians or that are of an Australian topic. They employ their PANDAS (PANDORA Digital Archiving System) when building their catalog.
textfiles.com is a large library of old text files maintained by Jason Scott Sadofsky. Its mission is to archive the old documents that had floated around the bulletin board systems (BBS) of his youth and to document other people's experiences on the bulletin board systems.
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