Open your Windows File Explorer and go to
C:\Users\<Username>\AppData\LocalLow\Phodex Games\Raidborn

The file with "player.sav" contains all information about your character and world.

Copy paste "player.sav" somewhere to save your progress.

Without or deleting "tutorial.sav" you get some of the tutorial pop-ups again.

Open your Windows File Explorer and go to
C:\Users\<Username>
If you dont see the AppData Folder click the "View" tab at the top and check the "Hidden items" checkbox

OR

Press Windows + R button
The "Run" app window appears. Write %AppData% into the searchbar and click OK