The ten minutes you mention refer to Word's autorecover feature; it is different from Previous Versions in Windows. The feature in Word only applies when Word has crashed or when you have forgotten to save an
untitled document.
What you can try is the following: In Windows Explorer, right-click your C:\ drive and select Properties. On the Previous Versions tab, see if you find a backup of C:\. You can then open it and go to your documents folder and have a look.