not to be a d*** here but you have countless ways of backing up your char and restoring it.
I offer my help to restore your char and i will teach you a way of having 2 saves.
The quest was tested a lot on dc, it didn't apear yesterday, it's been there for months, so can you explain in what conditions did the fsod happen?
Also, there is one known bug in the quest
exclusive for pso pc, wich is the canabin room, killing some of them at the same time (techs, needle) can cause an instant crash.
There are lot's of things that cause
FSOD on all ships, i could give you a quick example, but i would be accused of attacking someone and degrading their work despite beeing a fact.
So my recomendation is to relax, ask for someone to help you and report the bug to dc-talk.
If you don't want to play the quest then don't, lvl up like the other players

edit:
You used GC?
I'll ask impulse to remove it from beeing avaiable on GC and fix the pc bug that might happen. As for beeing avaiable for dc/pc, it will keep that way as the quest works properly.
My guess is that both the pc version and gc version have some sort of spawn limit, the dreamcast may also have it, but it was never experienced, on the pc version the canabin room can become problematic if things aren't done correctly and the gc possibly has an even lower limit, so low that even a room in forest is way to much.
I can't be sure obviously.
Since a fix would most likely turn every single room in one that is very similar to the regular TTF then the quest would lose a lot of it's unique features, all that to please the GC players that want to lvl up even faster.
So my recomendation is to fix one thing for pc and then remove the quest for gcubers. Regular TTF seems fine to lvl up.