Re: CDs were always noted as sub 5 year lifespan.
No storage medium is very good. For important stuff, there is no remedy for having to store it on multiple media. It's annoying, but whenever you don't and the data is important enough or needed after long enough, something will be broken. We could probably have a long discussion of what the most reliable type of media is, but I'm going to stick with my personal observation: redundant media.