[bsdice]

I have anecdotal evidence that CDs can lose 2x2mm chips of the reflective layer after 10-20 years. Also I have seen Blurays written 5 years ago starting to get read very slow because of alot of error correction and read retries going on. You really have to write all Blurays at 1x speed or whatever is lowest and then check using Opti Drive Control by Erik Deppe (good luck finding a compatible drive in 2022!) the quality of your burn. 25/50 GB at a time.

Tape like LTO 6 is quite cheap these days and will last a long time when stored vertically in a dry, cool, dark place. Also at 2.5 TB net capacity per tape with barely used tape prices of 5-10 bucks one can easily write a couple more tapes just in case one is damaged. I think for leader pin damage there is a repair kit and if tape rips in two I remember there was a repair service by IBM which can fix even that and send you a fresh tape with the data or a repaired tape.