An archive ~ but do they have backup?

www.archive.org

The web is full of incredibly useful sites that compile, free of charge, links to everything we do and don't need to know. And very often we call these archives. The catch - how well protected from fire and flood are the archives? Are there back-up archives? Are there "fixed" (untampered with) archives that we can refer back to, confidently knowing they have not been "fixed-up" (if you will).

Yes yes, there are all these things. The point though, is that these things are all rather loosely connected and a major meltdown would loose them all.