One of the occasionally useful but not very well known resource on the web is related to the web itself. It’s the Internet Archive Wayback Machine.
As the name indicates, it saves snapshots of the internet content as it appeared at some times in the past. As of now, it has saved 487 billion pages. The wiki has more details, which is definitely worth a read. Where is it physically located? Wiki says:
“The Archive has data centers in three Californian cities, San Francisco, Redwood City, and Richmond. Its collection is mirrored for stability and endurance at both the Bibliotheca Alexandrina in Egypt and at another facility in Amsterdam.”