How to manage worlds and backups on your Core Keeper server

A Core Keeper server holds several world slots and loads one of them. Switching between them is a config change, not a deletion.

1. Find your world files

1. Stop the server in the Game Panel.
2. Open the Files tab and browse the dedicated server data folder, next to ServerConfig.json.
3. World saves are stored per slot. The slot the server loads is the one named in the config.

2. Start a new world without losing the old one

1. Stop the server.
2. Open ServerConfig.json and change the world slot to one that has not been used.
3. Set the worldName and worldSeed you want.
4. Start the server. A new world is generated and the old one stays where it is.

Switching the slot back later brings the old world up exactly as you left it.

3. Download a copy

1. Stop the server so nothing is being written.
2. Download the world files from the Files tab.
3. Keep them somewhere off the server. A copy that only exists on the server is not a backup.

Do this before adding a mod, before a large update and before any change you are not sure about.

4. Upload a world from single player

1. Stop the server.
2. Find your local save on your PC, in the Core Keeper folder under your user profile.
3. Upload it into the server's world folder, matching the layout of the files already there.
4. Point ServerConfig.json at that slot and start the server.
5. Check the console for the world name it loaded.

5. Rules that avoid lost worlds

• Always stop the server before copying or uploading. A world file copied while it is being written is often unusable.
• Never delete a world folder to start fresh. Change the slot instead.
• Keep the Game ID stable when you switch worlds, so your players do not have to be told a new one.

Open a ticket from Support in the Client Area if a world will not load, and tell us the slot and the world name you expect.