I would humbly suggest that you check your older CDs to see if they are still readable - due to oxidation of the mirrored surface that can occur where micro-cracks may exist at the edges a home-burnable CD or DVD can actually become unreadable just sitting on the shelf. Since optical discs are read from the outside in (opposite of a vinyl record) that oxidation at the edges (where the cracks can occur even as the result of flexing the disk to mount it on a spindle) once the outer edge goes the disc becomes nothing more than a coaster. This has happened to me years ago - it's one of the reasons I switched my backup procedure to use external hard drives (in fact, I rotate between 3 sets, one of which is kept offsite in a bank vault).

As hard drives get cheaper (2TB for $100 or less) individual disc storage does not make sense. In addition, where in the future it may be ever-more-difficult to find a device to read your CD (try to find a reader for 5-1/4" floppies or Jaz drives, etc.) hard drives connect with more standardized cabling. And even if, say, USB is getting phased out in the future then copying the contents of a USB (or Thunderbolt, which apparently IS getting phased out - thanks for another twist, Apple) it is not difficult to copy the contents of an old hard disk to a new one that does use the latest and greatest connection scheme.