HDHacker is a stand-alone micro-util that saves, visualizes, restores the MBR (from a physical drive), the BootSector (from a logical drive) or any sector from a disk too.
It can be used, for example, to save and restore a particular boot manager (as LILO, for example) in case of a Windows new setup (that, obviously, overwrites it) or for simple precautionary purposes too.