> You can extend the lives of writable and rewritable optical media by proper storage. The key is to avoid light and heat as much as possible, to keep the dyes stable. I'm not sure about 30 years, but you can probably get 10 out of properly stored optical media.

Though, if you care about longevity, it might be better to use a technology like M-DISC. It uses a different recording technology to "[burn or etch] a permanent hole in the material, rather than changing the color of a dye."

https://en.wikipedia.org/wiki/M-DISC#Materials_technology