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You know when you time travel you actually wouldn't go back in time, you will go into an alternate universe resembling the point of time back then in our universe, but the twist is still the same as if you just went to an alternate universe right now, our universe wants you back because energy is missing and every universe has always a fixed quantity of energy which will never get lost, but if that will happen when you leave this world there will be instability in the firmament of the host and receiver universes, one has less, one too much energy. Everything you do in the alternate universe with persons which actually existed in your universe will be saved on your "energy data" and in one point you will go back to your host universe, the data gets compared to your original data sample before the leave to check if you are still the same person and everything what happened to people who are still alive in your universe and in the other universe or were will become reality of this universe, so you just created an alternate universe of your original universe.