I run a gaming site and the game history is far too valuable to 'delete', but with nearly 700K posts, I need a way to clean house.

I would like a means (like Prune) to PruneToHTML.
The technology already exists since the Email-Thread functionality already knows how to take a thread and extract all the bits from the database and create an HTML email. What I want is two steps beyond that functionality:

1. write the HTML to a directory of my choosing
2. delete the original thread (optional)

We've had a few discussions about archive capabilities within the UBB, I think it's a much needed feature to aid users with topics that just are completely dead as a doornail

I would prefer export to HTML.
I don't want to mess around with a database for my flat file historical database.