I am still furious that the better part of four years of research notes are trapped on an overpriced white brick that used to be a Mac Mini until its hard drive exploded. I also hoard paper notes, often for longer than I keep the things that they're notes on - a project is often finished, out there in a way that makes further editing and tweaking unhelpful to someone, but notes are like compost for ideas - they're more fertile the longer they're left.