I've done the Data Transfer that Feldynn is talking about, when my fatty died. It is real simple, and it tells you step by step what you need to do.
Also, as already mentioned, save your game save to a USB stick, just to be safe. After my fatty died, I always backed up my game save to a USB stick after every session. Probably overkill to do it that often, but if something happened, I'd have an up to date file to get going again.