With thousands (millions?) of pages added to Internet sites each day and likely just as many being removed, preserving access to government and private sector information that was once on the Internet is important to researchers and journalists searching for context to current events.
The Memory Holes (www.thememoryhole.org) was set up in 2002 to do that. Founder Russ Kick assembles links to pages long thought gone from the Internet.
You can sign up for The Memory Hole newsletter to learn about new additions or just stop by the site to see if it has anything of interest to you.
BTW, The Memory Hole is a big user of the Freedom of Information Act. They post everything they get.