Some companies like Google, Creative Commons and Gutenburg take this very seriously actually. There is always the potential that data becomes inaccessible. Look at recent history, they can no longer read the data disks with readings from moonrock which they obtained in the 60s. They have to build new machines to read it, something not easy.
If you have some obscure DRM encryption on material, if the company goes out of business it is possible for it to be 'lost'!
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