Microsoft’s plan to preserve music for 10,000 years with glass (fastcompany.com)
It’s like the Global Seed Vault, but for music. Interesting quote:
“By Microsoft’s estimation, hard drives protect data for five years before they can go bad. Tape lasts about a decade, while CDs and DVDs can make it as long as 15 years before their contents are at risk of becoming illegible.”
Don’t rely too much on your physical media.
I wonder where they get the 15 year figure from for CDs and DVDs? I’ve been buying, and still have, CDs since 1982 and DVDs from about 1997. I don’t think I’ve had a CD fail, and only remember one DVD failing (the studio replaced it no charge). Then again, I probably take much better care of them than the average consumer. 
I don’t remember a CD failing because of age either. They may be referring to writable CDs and DVDs though.
That seems more likely. I don’t have many CDRs, but have come across one or two older ones that are failing.
I have two that have degraded. The original Joshua Tree (two copies, both with the same problem, and Van Morrison’s Enlightenment. Pin pricks on U2, and colour change on the other. I can live with a 0.002% [partial] failure rate. All backed up in the cloud.
Likewise I have a few CDs that no longer play and very glad I ripped them as FLAC.
I have had multiple failed DVDs and there was a bleed issue that caused this for many users where the cover print went through the layers