rewind-the-reverse

I always have a question in my mind﹣ what if I could go back to the past? If I could redo what I've done, would it be the same?

To go back to the past, I need to go backward, go back to the time that I want to re-start. Like video playback, the video can be rewind to any point for replay. People only concern the replay, but, what about the rewind?