My process goes like that.
I shoot RAW, than I download them to my drive C.
From there I make a copy to my drive F (images up til 2011) or G (images from 2012 on) and another copy to my drive D (backups).
At this moment I erase the copies on drive C since I have two copies now.
The ones on drive D I organize in 4Gb groups and make two set of copies in DVD´s, than I erase them and only at this moment I erase my CF cards.
Once in a while I make a copy of my drive G to an external hard drive.
At my drive G I have the raw files sorted by year, month and day.
In every day I have the RAW files in the root and a folder called Corrected where I leave my processed jpgs.
I use Photoshop so after processing the files PS it creates a xmp file that saves all the processing parameters.
Once I finish 100 DVD´s I check the older ones to see if there are any corrupted and make a new copy if needed.
Canon EF 70-300mm IS/USM f/4-5.6
Canon 100mm f/2.8 USM/Macro