But WHEN is it?
Earth of the past, near present, or far future? Is it even Earth or another colony of the 13th tribe? What about the other cylons? The ones on the other side of the civil war. What about the Cylon homeworld(s)? All of those baseships and resurrection ships had to be built somewhere.
If that planet is uninhabitable, couldn't they all just go back to Caprica? The Cylons seemed to be living it up there a few seasons ago.