I just noticed over on phpbber.com in the tech support section that you can get your individual board backed up for a fee of $25.
http://www.phpbber.com/support/viewtopic.php?t=410
They back up the whole system daily, weekly and monthly, but apparently it is a 2-3 hour thing for them to back up a single board, so they charge for it.
Why, again, are we going to move somewhere else? Why not stay where it's free, since backup IS available?