Traveling to the past? No, not in my estimations.
What is time?
Time is an abstract human concept for sequentially arranging events on a Ray oriented time line; the origin of which is unknown.
They say "Time" exists as the fourth dimension, but really? Time is beneficiary to the inverse of the paradoxical vacuum of the concept of Oblivion.
This universe and existence itself is the forced alternative contingency to the concept of absolute oblivion. It's a vacuum of necessity (We are the proof that reality has a propensity towards "being" instead of utter Oblivion)
So what is time? Its a human cognitive invention that allows us to reckon the order of events. "True" Time exists by necessity. They say the universe is expanding, but what is it expanding into? by definition UNI (one) verse implies that ALL (physical) existence falls within the boundary of the "One" zone of tangible existence. Time is infinite by proxy.
If the universe is a massively infinite volume of "Spacial capacity" wherein all things are contained; then time is the equally massive infinite "frame rate" in which all things move change and operate.
The only thing even remotely like it is if you were to somehow treat all matter in the cosmos as a VHS tape and sequentially trace each and every atom back to a former common distribution, thereby essentially forensically "reconstructing" everything as it once was.
Rather than sending a single agent in the present to a former "run" of the VHS tape of time all the while every single fraction of time throughout eternity past future and present simultaneously runs concurrent on a sort of infinite mountain of time compression wherein each "layer" stacked upon "layer" would represent a single inconceivably small base unit of time....
I do not think "time" in this tangible sense truly exists as something that can be manipulated or restored. Time is "amorphic" and not as it were, an infnite series of "saved states".
Time is not composed of a series of static "building blocks" or "moving parts" or layers, but rather, is one huge "cell-less" ever changing unit of dynamic sequential placement. Time is an eternal "present tense" that constantly overwrites itself and not as a chain, being a series of links in succession.
By moving at certain speeds, it may be possible to distort the RELATIVE AFFECTS of time on the body and perception of the mind, but this is a sort of "slight of hand" illusion. This would have no true affect on the natural flow of time. Even this mirage only works in advancing the time line, not reverting it.
I don't think it will ever be possible, but, Great Scott; it sure would be sweet! No, not really. Someone would just ruin ****.