omg something unexpected came up and i had to re-install rpg maker ,i'm so glad i had made a backup of my game a few days ago or all would have been lost ...i just have to re-do 3 map
Make a back up often, It's totally needed if you make a couple of new maps or add some stuff that took allot of time. I know one time a version of my game broke and it wouldn't work at all. Best to keep your work safe.