The Dink Network

The problem with going backwards in time, is that you'd have to first generate infinite - 1 energy to accelerate yourself past c. Once this is donw, you generate some more energy, and then go faster than light. Now you will be going backwards in time. Now the problems begin. To start to go slower than the speed of light, you will have to lose energy. But if you interact with anything, you gain energy. Soon, just by cosmic dust interactions, you will have been acclerated to an infinite speed, causing you to instantly dissapear, and end up before the beginning of the universe. But as space is a direct result of the universes existance, you would not be moving, as there would be nothing to measure your movement by. And you wouldn't be able to do anything either, as there is no time before the universe.
All in all, you'd end up being pretty pointless. Or a yottametter long smear on the cosmic void.