I was able to retrieve it up to the 118th reply, because tonight's backup just happened to happen before Justintime deleted it.
We're gonna try and get this server thing settled so that there won't be any more incidents where this happens... In the mean time, don't do any deleting of double posts.
According to Justintime's recollection of the incident, it was when he was deleting some double posts, then the server locked up, and when it came back, the thread disappeared.