Phoaties are kept on CD/DVD and two external hard drives.
Everything else is burned to DVD and may or may not be on 1, or possibly 2 external hard drives.
In general good quality DVDs will last at least 10 years. I think most coasters are not coasters at all, just people who have changed their optical dive which can't read the disc.
Anything you really want to keep needs to go onto something solid state and not optical or physical.
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