My understanding is that someone was trying to steal the entire database (there are models at 3dc which don't appear anywhere else), and because of stupidity and ineptness managed to corrupt the data instead. Having data dumped back on itself sounds like what happens with cross-linked files (I've seen text and graphic information intertwined in ways which are forbidden in most civilized areas). Why would anyone want to take the entire database at one shot? Probably to sell it as a package. We can add lazy and greedy to the hacker's profile.