# boot from liveubuntu usb drive (8G)
# dd from liveusb terminal

# Is the usb disk mounted properly?
ls /media/natdawg/Seagate\ Expansion\ Drive/ubuntu.restore/
mount | grep media

sudo dd if=/dev/sda1 of=/media/natdawg/Seagate\ Expansion\ Drive/ubuntu.restore/sda1_boot.img bs=64K conv=noerror,sync status=progress
sudo dd if=/dev/sda2 of=/media/natdawg/Seagate\ Expansion\ Drive/ubuntu.restore/sda2_ubuntu.img bs=64K conv=noerror,sync status=progress
sudo sgdisk --backup=/media/natdawg/Seagate\ Expansion\ Drive/ubuntu.restore/sda_gptheaderonly.img /dev/sda

# 500mb is a very large efi partition in the future you should set 100mb