I think i have a solution, well at least for Windows 7 users!
Do not stop Octane,instead as Octane continues to render, just put the computer into Sleep mode, then switch it off at the wall socket.When you switch it on the next morning and hit any key,the machine will boot up from it's previous sleep state and Octane will resume rendering from where it left off....Well it did for me anyway on my machines Configuration.
