Keep in mind there are plenty of other reasons to install a GoBack feature, among them are downloading things you wish you didn't, or deleting a file (ReadOnly or not) from Windows Explorer, or reversing a save you wish you didn't make. Be aware, this will also make emails and everything else get "un-updated", so pre-save your settings before going back in time. Small price to pay for consideration to plan for when the trade-off is you don't lose all your hard-earned information by destroying a file.