334 MB including that backup mod that you released a while back.
I think the per-user data cap for save files would be 1GB (although I could include an option to not upload screenshots which would give you guys a whole load more space).
You do seem to like suggesting how I should be doing things. I have plenty of space to accommodate 4.5TB of data - I doubt people will be using their 1GB quota any time soon though. Saves would only be archived to RTB as you save them - it won't immediately upload your entire saves folder. Given that a bunch of the people who have large save folder sizes have been playing for atleast a couple of years now I think I won't even hit the 1TB mark for quite a while.