By Paul Thurrott
Windows 8 includes a feature called File History that caches, or backs up, different versions of your documents and other data files, so you can “go back in time” and recover previous or deleted versions of those files. It’s a great feature that builds on technology that’s been in Windows since 2003—long before Apple copied it with Time Machine—and it works very well. The trouble is, File History is disabled by default in new installs of Windows 8. So you’ll need to enable first.
Source: Paul Thurott's SuperSite for Windows