When Microsoft introduced File History with Windows 8, cautious PC users were happy: it gave you a Time Machine-style backup that let you recover older files if you made a mistake. You might not get to take that feature for granted, though. Users trying a leaked Windows 10 Insider Preview build have discovered that creating new File History backups is "no longer supported." Provided this change sticks, you might lose the feature by the time the Fall Creators Update hits your PC. We've reached out to Microsoft to see if it can comment, but the find is already raising a question: if File History is going, what (if anything) is replacing it?