>>2753335>DVDAccording to the Optical Storage Technology Association (OSTA), "manufacturers claim life spans ranging from 30 to 100 years for DVD, DVD-R and DVD+R discs and up to 30 years for DVD-RW, DVD+RW and DVD-RAM".
>Blu-rayThe recordable media used in red laser disc technology like DVD's and CD's is an organic dye that is very sensitive to light. Blu-ray disks, however, use a combination of silicon and copper which is bonded during the burning process, this alloy is much more resilient than the organic dye. Manufacturers claim a life span from 100 up to 150 years for Blu-ray disks.
However, these media don't exist long enough yet to confirm or reject those claims. So at the moment, it's "about as long as the oldest working DVD/BD is still working". These claims are made assuming the disks are stored properly. (Not too hot, dark, not too humid, etc.)
Therefore also use
>Cloud Backup>Multiple External Hardrives 
