My friend has a Minecraft realm world running and has built there big stuff this he now wanted to share with me and has made a current backup, then it was saved with him in singleplayer there everything worked. where he copied the files from the .minecraft folder and saves and uploaded and I downloaded them and inserted in saves and opened it is indeed the same world but without what he has built. He has even downloaded the files and again inserted into his saves folder then it no longer works, so he has not seen what he had built. What is displayed is the unchanged world as it was generated.