I put all my pdfs on a cd as soon as I download them to my doc file from the internet. I print out the ones I think I will make in the future and put them in plastic sleeves in a 3-ring binder. I have a shoe box full of cds!! And a cupboard full of 3-ring binders! And still more pdfs in my doc file to put on cd! It's a vicious circle, but I love it!