Web Archives
WayBackMachine

Internet Archive's Wayback Machine is a digital archive of the World Wide Web and other information on the Internet.
Founded by the Internet Archive, a non-profit organization, it has been archiving websites since 1996.
It works in three steps:
Crawling
Archiving
Accessing
Web Recon through WayBackMachine
Uncovering Hidden Assets and Vulnerabilities
Tracking Changes and Identifying Patterns
Gathering Intelligence
Stealthy Reconnaissance
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