I just switched servers from redhat 6.2 to 7.3 so don't know how applicable this will be. I copied across the contents of cgi-bin, set permissions, then copied across the latest versions of directories like Templates, just prior to setting the new server live.
I created a blank 'forum' database (I use webmin on redhat), then imported a dump of the database from the old server using the SQL Execute command. The import/export options were pretty straight forward and I muddled through. I've never had to do this before, but I was able to easily set up on the new server. I expect you'll be able to do the same, without having to install from scratch and lose all users.
Jason
I created a blank 'forum' database (I use webmin on redhat), then imported a dump of the database from the old server using the SQL Execute command. The import/export options were pretty straight forward and I muddled through. I've never had to do this before, but I was able to easily set up on the new server. I expect you'll be able to do the same, without having to install from scratch and lose all users.
Jason