#world

Stop the server, compress the world folder in Files and download the zip. You can also download a backup or copy the folder with SFTP.

Stop the server, delete or rename the world folder(s), set a new level-seed in Properties if you want, and start the server to generate a fresh world.

Zip your world folder, stop the server, upload and extract it in Files (or use SFTP), then set level-name in Properties to the folder name and start.

Install Dynmap or BlueMap, set its web server port to an extra port from the Network tab, and open http://your-server-address:port in a browser to see a live map.

Restoring a backup is the safest fix for a corrupted world. If you have none, level.dat_old and region editors like MCA Selector can save most of it.

The server crashed while updating the world. The crash report names the cause, often one broken entity or block entity at specific coordinates. Remove it carefully, with a backup first.

Generating new land is one of the heaviest jobs a server does. Use Chunky to generate the world ahead of time, then add a world border so players never trigger it during play.