Thankfully post loss won't happen very often indeed. Of course the entire board was deleted and closed at a few occasions around 2006-08 but when deleting an Invisionfree site as a whole it actually creates a full backup on their server (although it takes around 4 years to get it back). As for the current SMF site, data loss only happened twice so far: May 10th 2009 and yesterday. (May 10th 2009 was a failed SMF upgrade to 2.0)
Omg, that's even less often than I thought. Combined with the significant server issues and downtimes and this doesn't look good. I really hope it's more just Netham45 just testing rather than actual problems for Omnimaga.