Organized in a way I only understand.
My older stories are all hand-written. I didn't start typing up stories until last summer when I got my laptop, so new stores are on my laptop. However, I have notebooks and notebooks of ideas and older stories stored away. I tend to know what's where, buuut not always. I get confused between notebooks and story versions easily because I wrote so much in the past 5 years or so.
Also, I keep a little notebook on hand in case I have to write things down right away. I also have a larger notebook I use solely to work out outlines & ideas, but not to actually write stories. However, I forgot it at home when I came back to college. I swear I packed it. :c