We can take the backup of MBR either to a floppy disk or to a CDROM.
01. Backup to a floppy:
[root@daddylinux~]# dd if=/dev/hda of=/dev/fd0 bs=512 count=1
02. Backup to CDR:
First, create the MBR backup to a file on your hard drive.
[root@daddylinux~]#dd if=/dev/hda of=mbr.bak bs=512 count=1
Now, burn the file you just created to CDR.