Don't worry about overwriting your normal save file in The Legend of Zelda: Breath of the Wild while tackling the upcoming Hard Mode.
The Nintendo U.K. website says there will be a separate save slot for the mode, which is part of the first DLC pack for the game called The Master Trials. Breath of the Wild's Hard Mode (named Master Mode overseas) will only offer two save spots, though, compared to six in the normal game.
This is a syndicated post. Read the original at IGN Video Games 2017-06-19.