Checkpoint64 has a preset for Minecraft (Java): it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on Minecraft (Java):
Minecraft (Java)
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Save file location
Windows:
%APPDATA%\.minecraft\saves
macOS:~/Library/Application Support/minecraft/saves
Linux:~/.minecraft/saves -
Backup guide
A single corrupted region file can wipe a Minecraft world you've built for months. Checkpoint64 backs up your saves folder automatically and keeps every version, so a broken chunk is one click from restored. Free download for Windows, macOS, and Linux.
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Server ports
TCP 25565 -
Sharing with friends
How to share your Minecraft (Java) world with friends, from playing live to taking turns when the host is offline.