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What to backup before installing GRUB on a GPT disk?

From: Ariszló
Subject: What to backup before installing GRUB on a GPT disk?
Date: Fri, 23 May 2014 10:15:11 +0200
What does GRUB overwrite on a GPT disk?

On MBR disks, backing up the first 440 bytes would allow to later restore the original MBR:

sudo dd if=/dev/sda of=mbr bs=440 count=1 #backup
sudo dd if=mbr of=/dev/sda #restore

What should one backup on a GPT disk before installing GRUB?
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