Factory Reset destroys all saves

I am making this because I have a map that Ive been working on for a month on the 'full version' and my game crashed and refuses to launch no matter what (once again) I know that the only fix is to factory reset my xbox. However, when I did this a while ago, my data was saved on all games BUT this one; all of my saves I was working on were annihilated & lost forever. I want to FR the console, but I know the consequences, so I need this fixed.