How much is enough

I was having lunch with Pat the other day and we were debating whether or not it was worth the effort to delete stuff and he brought of an excellent point about how much space do you need to record the audio that a person listens to for an entire lifetime. Hmmm... That sounds like it would be a lot of space. Well, my music collection is 14.8 days of music (according to iTunes) and it takes up 25.36 GB. That's 1.7 GB per day. The average lifespan of an American is 75 years, which is 27375 days, so it would take 46.5 TB to store an entire lifetime's worth of high quality audio. That may seem like a lot right now but that's 75 years worth of Moore's law. Let's say that you by only 18 months worth of storage at a time. Right now 18 months worth of audio (930 GB) will cost you about $400. The next 18 months will cost you $200, the 18 months after that will cost you $100. You'll probably not spend more than a thousand dollars to store your life's audio if you started right now.