No, you cannot back up your BIOS. Your BIOS (Basic Input\Output System is used to directly manipulate the hardware of your machine in order to perform the commands you give it. To my knowledge, atleast, you can flash your BIOS in order to upgrade, otherwise, I don't think that your BIOS are easily coorupted. I think it's your registry you should back up (we all do stupid things). The command can be given by clicking on start, then run. In the text space, type regback, and this will back up your registry. There may very well be a way, however I don't think it's a common practice, therefore, (possibly) not that important.