Thank you for an information, Mrs.Flynn. More than 12 hours to search for that million-legs creature, no sign of it. Now I have to move my PC and all the things to my living room. It's time to check if there is nothing has been really messed up (like my house now, lol). I've checked it, both last saved and last backup and it looks like everything is fine. Don't know if this may has any problems in my town in the future but not now. I should be more careful in the next time, likes copy my last saved-game to the desktop and the methods that you adviced.
Excuse me, I have an another question. Which is more safe or better choice to play, a last saved game or a last backup game (or both in equally) ? These two files has a progress that didn't different much, just around 30 in-game minutes. Right now I choose a backup file because I think it was more safe than the last saved file.