Web archives can provide access to sites that have since been deleted or changed, so that users can specifically access material that they are no longer able to access on the live web. This is perhaps the use of web archives most familiar to casual users, as the Internet Archive’s Wayback Machine and similar services make the contents of web archives easily accessible based on URL and date.
Tool allowing users to capture and access previous versions of websites
Internet Archive collection of Geocites sites captured prior to its 2009 shutdown
Blog post about preserving at-rish content to prevent it from disappearing
This case study is part of a Web Archiving Use Cases report written by Emily Reynolds for the Library of Congress.