Bad for history maybe, but I liken this sort of thing to personal email archives.<p>I find that if I don't cull aggressively as email comes into my inbox, I wind up with an archive that is not only huge and unwieldy, but full of stuff I will almost CERTAINLY never need to read again. Unless you are a god with regular expressions, the best time to clean up archives is <i>as you are making them</i>, rather than a hundred years from now when the archive has eclipsed available storage capacity.<p>Archiving stuff is great, but I try to stick to discarding the useless, the mediocre, and the pretty good, and only saving the remarkable, notable, and fantastic.