Backup your MBR

Master Boot Record (MBR), a small program that is executed when a computer boots up.

You can save your MBR with a simple DD-command to a file:

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dd if=/dev/sda count=1 bs=512 > /var/backup/MBR

From this file you can restore your MBR very easy:

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dd if=/var/backup/MBR of=/dev/sdb