#!/bin/bash
windows_device=/dev/sda1
default_image_file="/home/windows/user/Documents and Settings/Admin/My Documents/Backups/sda1.ntfsclone.gz"
image_file="${1:-"$default_image_file"}"

echo "
You are about to back up the Windows system partition (C:) to the backup file
$image_file.

This will let you, at some later date, restore Windows (including all
installed software) to the exact state it is in right now, while keeping
your own files and folders (stored on D:, the User partition) intact."

if test -f "$image_file" -a ! -L "$image_file"
then
	echo "
However, since you are about to over-write an existing version of
that backup file, you will lose the ability to restore Windows to
the state it was in as of $(date +%c -d @$(stat -c %Y "$image_file"))."
fi

read -p "
Is that what you want to do? " reply
reply="$(echo "$reply" | tr A-Z a-z)"
if [ "${reply:0:1}" = "y" ]
then
	mnt=/tmp/backup-windows-$$
	sudo sh -c "
		umount '$windows_device'
		mkdir $mnt
		mount '$windows_device' $mnt
		rm -f $mnt/pagefile.sys $mnt/hiberfil.sys
		sync
		umount '$windows_device'
		rmdir $mnt
		rm '$image_file'
		ntfsclone --save-image -o - '$windows_device' | gzip -9 >'$image_file'
		mount -a
	"
	read -p "
Press Enter: "
fi