Luckily our ISP has better backup practices than I do.
Still, we need to upgrade to VB4 or 5, because MySql 5 and VB3.x don't like each other that much. I still don't know what happened to our database, our ISP suspects a hack and I changed all relevant passwords but I'm not so sure of that. I didnt find any recently uploaded or changed files, nor did our ISP, which is to be expected in case of a hack.
I wouldn't be suprised if some MySql update ruined the database or that the combination of VB3.x and MySql5 somehow made the forum drop the majority of the tables.
I will be backupping regularly from now though.
PP