I'm looking at the feasibility of actually storing everyone's saves and their screenshots on the RTB servers. Each time you save, your game would secretly upload it to your RTB account where it would then keep a history of overwritten files (so you can get older versions of something you overwrote accidentally). This also allows you to use your saves if you visit a friend's house for example, or you're just using another pc.
Based on the sizes so far, we're looking at an average of around 50-60MB per user including screenshots - multiply that by 4500 (roughly the number of RTB users) and you've got ~263GB of data to store in total (which again is not including the history of overwritten files which would inflate the size considerably per user).