What are the best commands to make backup for most important part of the hard disk [ MBR ] , and what is the best command to fix it when it fail?

(MBR (master boot record

You only need one command to backup it;s:

dd if=/dev/sda of=path-to-save/mbr-backup bs=512 count=1

To fix MBR you should following this instruction:-

1. Download Easy Recovery essentials
2. Burn the image
3. boot easy recovery essntials
4. choose automated Repair option and click contiue
5. choose your windows insallation driver letter and click on automated Repair
6. Easy Recovery essential will now begin
7. once the process is complete click Restart
8. Done you windows loading Now

Jun, - All Windows versions – Windows XP, Vista,7 or8 – use MBR and, if damaged ... You can backup the MBR since it's stored on the hard disk and you ... In this command, /path-to-get/mbr-backup is the path where you ... recovery and repair CD/USB, is guaranteed to repair most damages .... Registry failure✓.