Direct answer

For a replacement primary world, stop the server, back up its world folders, choose a new unused level-name and then start again. For additional worlds on one Paper server, use a world-management plugin that explicitly supports the build.

Recommended procedure

  1. Record the running Minecraft version and server software; ensure nobody is logged in and issue save-all flush followed by stop from the console.
  2. Copy the old overworld and Nether/End data off the host and check the archive includes level.dat and the required dimensions.
  3. Edit server.properties with the server stopped, for example level-name=newworld; choose a folder name not used by any existing world or plugin.
  4. Start the server, wait for generation, and compare the new save directory with your intended settings.

What to do next

Only configure a new seed or world generator before first generation; changing the seed later does not regenerate old chunks.

How to verify the result

Visit the new spawn and Nether/End, inspect console errors and confirm that the old world backup remains restorable.

Version and compatibility notes

Paper, Vanilla and modded servers can store dimensions differently. Additional worlds often require Multiverse or an equivalent plugin; level-name does not create a multiworld server.

Official references

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