I wanted to play further and missclicked on "new game". There is no safety question for this, it instantly reset all my saved data and i started directly a new game. It also saved automatically so it wasnt possible to get my data back.
There are also bugs, if you have your Trading post, gambling/city hall and so on open, you click on "Conquer" and fight against the enemy, you cant close the windows! You have to leave the game and restart. This was the reason i missclicked on "New Game". So after this, all was gone. I dont want to play this game again.