Board Thread:LotR Mod Technical Support/@comment-29145474-20160808002936/@comment-25330335-20160809143429

Well, you should do what it says. Programmers do things like this so you don't ruin your life. If you don't care about the world, go ahead. If you do, back it up first, then go ahead. If you don't know how to back up your world, just find your saves directory inside your .minecraft folder. Then copy the folder (and all it's contents, no dip) with the name of your world somewhere safe, and go ahead and play it. It might also generate an automatic backup zip in your saves directory, but don't count on it, since it doesn't say it will.