Checkpoint64 has a preset for Valheim: it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on Valheim:
Valheim
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Save file location
Windows:
%USERPROFILE%\AppData\LocalLow\IronGate\Valheim\worlds_local
macOS:~/Library/Application Support/IronGate/Valheim/worlds_local
Linux:~/.config/unity3d/IronGate/Valheim -
Backup guide
Valheim keeps each world as a .db and .fwl pair, and co-op groups constantly lose track of the newest copy. Checkpoint64 keeps every version with version locks, so one canonical world moves forward. Free download for Windows, macOS, and Linux.
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Server ports
UDP 2456-2457 -
Launch options
-console-window-mode exclusive-force-vulkan -
Sharing with friends
How to share your Valheim world with friends, from playing live to taking turns when the host is offline.