I'm unsure if this is an issue exclusive to me or it's just a system error, but I've had the game corrupt my save files twice, both times I failed to backup prior. I didn't have this issue on the previous build, but now I can't really progress past the first few hours of the game without my save being gone once I decide to close the game.
If it helps identify the issue, I can further detail what my routine was up until file corruption in reply.