I wrote a small utility that saves the MBR and master partition table (i.e.,
the first sector), but I think there are a number of similar utilities around
for example, go to
www.bootitng.com and download their free utility MBRWORK,
and see if that will do what you want. As for the PBR's, those are saved as
part of a partition image when you use Ghost, DriveImage, or BootItNG, so if
your aim is for backup purposes, that should be covered by your backup of the
partition itself.