I dropped my Laptop today and I can feel that the HD is in pain. Do you know of any GNU backup program? or I have to call in again the same old friend 'DOS' as I need a carbon copy!

Use dd to create an image of the drive. Or if it is already having problems try dd_rescue.
A quick google will show you what to do, but an example might be.
Find the drive: sudo fdisk -l
Clone the drive: dd if=/dev/sda of=disk.img
Once you have a replacement drive you can clone it back.