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If you want to start your Minecraft server on a new world this is very easy to do. You do not need to purchase a new server and can be playing on a brand new world in 60 seconds by following this tutorial. There are two ways to change your server to a new world which will completely reset it.
This is a great way to start over on a new world while saving the old world in case you need it later. All you have to do is go into the Multicraft control panel and change the world setting to something else. The default value for this setting is world, so we recommend that you change it to something like world2 which will make it easy to keep track of versions for you.
Another way to get a new world for your Minecraft server is to delete all of the files that are currently there. You can access all of the server files with FTP. There will be a folder titled world, or whatever your current world setting is, which you will need to delete. Once this is deleted a new world will be generated when you start your server again.