File History feature in Windows 8 creates backup of a file with the default interval of every hour, and it consumes a lot of space on hard drive, so, it can create problem for folks with low memory space on their system but no need to worry because Windows 8 gives option to adjust save file interval time as per your requirement.
Change the Save File Interval in Windows 8
Right click at the bottom left of the screen and click on “Control Panel” from the list
In “Control Panel” set view items by Category, and then click on “File History”, under System and security
In left panel of windows, click on “Advanced settings” and navigate to “Save copies of files” option, and click on its concerned drop down menu to see available options to change the save time according to your requirement
After doing changes in Save File Interval time, just click on “Save Changes” button at the bottom of window and thats it.