Archiving/dealing with photos is an on-going experience for me ( so too was learning effective post-processing techniques ). With this in mind, one always learns after the fact a more efficient way to do something -- or just another way of saying that you learn what not to do after you've done it.
I'm a P&S guy who evolves from a G9 to a G12 and the RAW capabilities of these cameras. Until I built a new dedicated photography computer which has the power to run Lightroom & CS6 products, I was shooting JPG, storing images on my computer and backing them up on DVDs.
Today, I shoot RAW and import into Lightroom, converting everything into DNGs and delete the lesser images. I use a portable hard drive to archive these originals and my post-processing work. So I'm being more careful and systematic. That said, as my 3TB hard drive fills up with RAW images and lots of HD video stuff, I belatedly discover that I really need to get a couple of more portable drives for archiving. Also still learning the power and nuances of Lightroom for cataloging and sorting into collections etc. As usual, I figure out the better way to do this after my first attempt at sorting. Such is life when you're an amateur who dabbles and not a pro who by necessity is better organized.