So how do you go about getting the earth back exactly where it was in the universe 500 years ago in time?
I'm thinking that's pretty much hard to do.
Quantum entanglement has been demonstrated over hundreds of miles. That also sounds pretty hard to do, but it happens.
https://www.sciencealert.com/physicists-just-quantum-entangled-photons-between-earth-and-space
I think time travel stories should be classified as fantasy, not fiction, but maybe I am wrong. The real world is a very strange place.