I run a FTB Infinity Evolved v3.0.2. I saved the server files into my hard drive, and want to restart the server with a brand new world. I have attempted deleting the world folder but it doesn't create a new world, the old world somehow comes back. I've restarted the entire batch of server files using brand new files with no data on it, and somehow, the previous world files are brought back. I don't understand what is going on, I don't know if there is a backup somewhere in your servers that are re-uploading it, I just want a new world for me and my friends to enjoy.