Depends on the disk technologies.
CDs are prone to flaking, otherwise most disk are suspectible of oxidation (disk rot) if stored improperly. M-Disk is a long-life variant of both DVDs and Blu-Rays, although more expensive. However, write-once disks are very ransomware-resilient, and I recommend to add a write-once media to any proper backup setup.
Android is just boneless Linux, thus it’s being the most successful open source operating system. I guess the number of Android devices outnumber all the Macs.