Follow the steps to taking backup of MBR
# sfdisk -d /dev/sda > sda.out
# cat sda.out
# partition table of /dev/sda
unit: sectors
/dev/sda1 : start= 63, size=480134592, Id=83, bootable
/dev/sda2 : start=480134655, size= 8257410, Id=82
/dev/sda3 : start= 0, size= 0, Id= 0
/dev/sda4 : start= 0, size= 0, Id= 0
To restore it
# sfdisk /dev/sda < sda.out
Or you can take the backup and restore grub using dd command.
Backup
# dd if=/dev/sda of=grub.bkp bs=512 count=1
Restore
# dd if=grub.bkp of=/dev/sda bs=512 count=1
# sfdisk -d /dev/sda > sda.out
# cat sda.out
# partition table of /dev/sda
unit: sectors
/dev/sda1 : start= 63, size=480134592, Id=83, bootable
/dev/sda2 : start=480134655, size= 8257410, Id=82
/dev/sda3 : start= 0, size= 0, Id= 0
/dev/sda4 : start= 0, size= 0, Id= 0
To restore it
# sfdisk /dev/sda < sda.out
Or you can take the backup and restore grub using dd command.
Backup
# dd if=/dev/sda of=grub.bkp bs=512 count=1
Restore
# dd if=grub.bkp of=/dev/sda bs=512 count=1
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