I've wanted something like this for a while, although I've not looked into it much.

That said, the snapshot search either isn't working, or isn't doing what I'd expect it to do. If I search for `fsf`, the snapshot search finds the FSF's website. But if I search for text that appears in the snapshot of the homepage (e.g. "sysop" or "sysops"), then I get no results.

I would expect the snapshot search to work roughly like Google, but for these limited snapshots of pages, but it appears to only search the URLs, maybe the page titles?