lSBF: There are still two issues: Let's suppose that your grand-grand-..-grandchildren decide to resurrect you in 200 years. To do that they need to know their present state of matter to conclude what state you were in when you died so they take the entire earth apart and measure the location of all atoms in the earth. The first problem is that a lot of information is totally gone: You were cremated so most of your information about you is found in the atmosphere where it (subtly) affects how light bounces off atoms -- since that information is then sometimes found in electromagnetic radiation, and a large fraction of that radiation escapes from earth never to be seen again, that means they are fundamentally going to be missing information needed to reconstruct you (unless they can somehow travel faster than the speed of light).
The second problem is about quantum uncertainty (as I mentioned). As time progress, small perturbations in a system are increased exponentially, meaning you need exponentially better ability to measure the present state of the system to reconstruct it's past state (to some fidelity). That exponential growth is really what's important: To even conclude that most of the atoms that make up you were together at some point (nevermind their configuration as a body --- just that you were not spread out in the atmosphere) will eventually require knowledge of all atoms at an extreme precision.
When that precision reaches quantum level Heisenbergs uncertainty principle kicks in (remember this is saying that there is a minimal limit to how well you can know a particle's position and momentum) and so you can't perform the reconstruction, even approximately, unless you can get around quantum mechanics.