I dont quite follow how CF Cards are safe backups? The very purpose of them is to format and use again and at that price you could buy quite a few 500gb HD    The wear and tear on HD if used only to backup photographs has proved for me to be very reliable, and I  double them up just to be sure..  

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt