Recently, there have been questions about backing up the game files. The following lines maybe help:

- if you need to undo any changes in the world, back up your files [C: \ Users \ (your profile name) \ AppData \ LocalLow \ IronGate \ Valheim \ worlds \ (your world name)] - be careful, there are 2 files with the same name and a different extension (.fwl and .db) - these are the current files and both are needed. Then there are the same files with a second extension (.old) - these are files before the current game starts.
- If you need to undo character changes (usually death and equipment loss), back up the file [C: \ Users \ (your profile name) \ AppData \ LocalLow \ IronGate \ Valheim \ characters \ (your character name)]. There are also two files - one with a suffix (.fch) - this is the current state of the character. In that with the suffix (.old) is the state of the character before the current start of the game.

Caution - the AppData folder is usually marked as "hidden" - therefore it is necessary to activate the "show hidden files" option in the folder settings.