Mini 9 w/Ubuntu - restore from USB

I know, I know, there are posts all over on this topic but I have yet to find a solution to my problem due to all the links people have provided now giving me 404 errors (page not found) on the web sites mentioned.

Simply put I have a Dell Mini 9 with Ubuntu Hardy 8.04 2GB RAM and 16 GB SSD.  No DVD drive.

For emergencies I would like to be able to restore the factory operating system (I don't care if it wipes all my stuff off) from a USB drive.  To do that I believe that I need the Dell ISO file.  I know I can just go to the Ubuntu site and get the stock one but I don't want to do that as you have to fiddle around to get some of the peripherals working.

If anyone can help me with a valid link to the Dell Ubuntu ISO file for the Mini 9 I would really apprecate it.  I do have the Dell Ubuntu DVD which I can read in my Windows XP box if that heps.

Many thanks in advance.