Hi UltraTerminator,
Uh-Huh, what a great question! I really mean it.
I can see that you somewhat have knowledge in moden physics. The physical idea of BackTime Travel is quite confusing therefore it ends up with some physics experts believe BackTime Travel is plausible and others do not.
I cannot inform you now the methods on BackTime Travel despite I am not 100% sure if this is plausible. They say it has to do with Blackholes and Wormholes and Gravity, and matters like that. However, to be honest with you, I do not agree with those Physicists. I have to find out how to travel time backward in the same sense as if we want to travel time forward.
I apologize that I cannot answer you now.
Cheers,