How about moving onto a better forum software, but still keeping everything from the old one as well, however totally independent from the new? You could call it Amiga.org archive and it would look exactly the same as it does now, however without any posting permissions, and the only purpose of it would be to keep historically important posts, or perhaps more, if space permits. You could just enable the use of search function on the old system and nothing else. Simply transfer usernames and their post counts (if this is a must) to the new software, and that's it.
