Did you check all 6+ domains? :)

I'm wondering how likely an old thread can be out of date, do you expect many monks updating what they wrote at 9/11?

Edit (answering myself)

Hmmm wait, besides editing we have indeed necroposts resurrecting old threads.

True, a backup service would need to check RAT or newest nodes regularly. (Or refrain to mirror only single posts)

And editing isn't recorded anywhere... :/

I didn't check all of the domains, no. I think the only valid archive would be an up to date database extract of node content (and some of the other metadata), rather partial snapshots of page impressions from a moment in time.

Update: I seem to recall different domains having different robots.txt rules to impact indexing.

Otherwise I'd poll the XML per node.

If edits are/were reflected in the timestamps of the http headers, this could also be quite efficient in fetching updates.

Cheers Rolf
_{(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery}