Very early in my experiences on-line, I learned the very simple and very obvious concept and importance of not only keeping material (fan fiction, images, videos, audio) due to potential for link rot, but for the fact you can read/view/play/listen to that material locally and while off-line again and again, thus keeping bandwidth and usage down. Win-Win, for me at least. While not near as important as it used to be for bandwidth, I still prefer to do the bulk of those activities off-line.