flashing BIOS is only dangerous if the version of BIOS you are flashing has features which are incompatible with the existing hardware, for instance, if it is for a later version. backing up your BIOS to a disk and adding the image to that, as is suggested in this article suggested by whitedragon, is actually quite safe, if there is an image already included on your version of bios, it is obvious that it is a supported feature, and therefore very safe. I see nothing inherently dangerous in what is suggested in the article linked above.