The idea of time flowing backwards in fundamentally flawed. The word "backwards" is immediately reliant on a relative state. You're only going backwards if something comparable is going in another direction. So you mean "backwards" relative to now time? What, your time? Or mine? Because I'm pretty sure we're moving at very slightly different velocities through spacetime, thanks to our different altitudes and slightly different distances from the sun, moon and planets, as well as the near zero (but not actually zero) effect that standing by a hill makes. All these means we're actually travelling through spacetime at very slightly different rates.

Time isn't a straight line where it's one way or the other.