Valheim has multiplayer but be warned, players can randomly lose progress with character resets, and wipes with no warning. Turning Steam Cloud save does not stop the problem. We run a private local dedicated server and have been plagued with character progress loss for months. We tried ever server character save mod out there and nothing would consistently work.

Finally we found a solution by running an external program on our server called Valheim Save Shield. It is made by the save people who make Valheim Server Warden which is the server manager we use. We just run both of them simultaneously on the server and it does the world and player character backups every 10 minutes. It has been working well for the last several days.

You can also run this on the client machines and it will keep backups of your characters.

https://github.com/Razzmatazzz/ValheimSaveShield