I'm not sure it's possible that human beings, given how advanced we are, the limitations of genetics, and our other social and biological properties are capable at this point in time of "preserving" our species. We will eventually destroy this planet...and if we move to another planet we will destroy that planet and everything on it. We will continue destroying things until something destroys us (which will probably be us).
We are too smart for Darwinism. We can evade pressures of natural selection, adapt to inherited genetic variations that should cause death, and alter the need for individuals to compete, survive and reproduce. Everything on this planet lived in general harmony with a sustainable cycle of life and death until humans started changing the way they live around about 15,000 years ago.