I renamed/swapped world folders — what resets? — Minecraft

Q: Do the `_nether` and `_the_end` folders follow automatically?

They're loaded relative to the level-name value. Keep their naming consistent with the main world folder so all dimensions load together.

Q: What's the cleanest way to switch between two worlds?

Keep each in its own named folder and change level-name to whichever you want active, restarting after each change.

I renamed/swapped world folders — what resets?

If you rename world folders without updating one key setting, the server will look like it reset — but it's really just loading a different folder. Understanding how Minecraft picks which world to load makes swapping worlds safe and predictable.

How Minecraft chooses a world

Minecraft loads the folder named in level-name (default world), plus its _nether and _the_end siblings. If you rename world to something else without updating level-name, the server can't find the expected folder and generates a new empty world — which looks exactly like a reset, even though your original world is still safely on disk.

Swapping worlds safely

Stop the server.
Rename the folders as you intend (for example, swap in a different world folder).
Set level-name in server.properties to match the folder you want loaded.
Start the server.

Tip: Back up first (download via Files/SFTP). Then even a mistaken rename is easy to undo.

Frequently asked questions

I renamed world and now it's empty — is my world gone? No — it's still on disk under the new name. Either rename it back to world or point level-name at it.

Do the _nether and _the_end folders follow automatically? They're loaded relative to the level-name value. Keep their naming consistent with the main world folder so all dimensions load together.

What's the cleanest way to switch between two worlds? Keep each in its own named folder and change level-name to whichever you want active, restarting after each change.