There are many, many spells on this site that are impossible to achieve and which will never work. Remember that spells can be rated up by those who don't understand the difference between fantasy and reality, or who wrote the spell and want others to think it is a good one.
You cannot clone yourself using magic. Science has managed to clone a sheep, but science considers cloning a human to be unethical. But the sheep, Dolly, was cloned using DNA altering. Magic does not and cannot alter your DNA