copy.sh

#/bin/sh

# the redirections are a bit confusing, but trust me it works
# progress_gpio.sh (change at your discretion) should read integers representing
# percentage progress and manipulate the leds accordingly

dd if="/dev/sda" | pv -EEn 2>&1 > out.img | progress_gpio.sh

# out.img should be a raw dump of the disk, but i'd recommend also
# saving an fdisk -l "/dev/sda". You could also compress the image
# with a little more redirection