It's more than one place, all humans shouldn't just be on Earth, because if this place was wiped out then we're gone, all that time/knowledge gained wasted. I

It's more than one place, all humans shouldn't just be on Earth, because if this place was wiped out then we're gone, all that time/knowledge gained wasted. I wasn't talking about as a solution to over population/pollution or anything. Just eventually when we have the tech eg. warp drive/FTL that would be nice.