android backup: image of mmcblk0 + mmcblk1
#!/system/xbin/ash
echo "serving /dev/block/mmcblk0 on :20099"
nc -ll -p 20099 -e dd if=/dev/block/mmcblk0 &
echo ""
echo "serving /dev/block/mmcblk1 on :20098"
nc -ll -p 20098 -e dd if=/dev/block/mmcblk1 &
echo "pids: $(pidof nc)"