Great to see you as part of the staff!
I have a xenForo forum which we upgraded as a test to IPS4 for a few months. We obviously still have the original xenForo backup when we did this in October, but it'd be nice to merge everything back into one place again given that my members hate the new software (specifically the post editor).
I suppose what we'll do is revert back to October, then leave the IPS4 version on a subdomain as read-only until an importer tool is made - It's only 3,000 or so posts between then and now so thankfully it's a convenience and continuity thing and not something more serious. Lesson learned.
Thanks for the speedy response, Chris!