I'm with Dastardly on this one. I get stuff *I* remember seeing/playing back all those moons ago. A complete rom/data set of all console/arcade/computer systems to date must be 150gb+ by now, something I'm not prepared to keep up to date
My dedicated emulation disc (DVD-R) has only about 1.5gb for everything I'm interested in. Programs and data, and several platforms. The only complete set on it is the Spectrum TOSEC as it's fairly small (~700mb).
TV/movies/music... now that's another thing :eek