If you want it to stand the test of time, use other methods that have provably stood the test of time, like a book. You know that will work. You do not know any

If you want it to stand the test of time, use other methods that have provably stood the test of time, like a book. You know that will work. You do not know anything currently digital will work. If this is important to you, I wouldn't mess around with "high tech" solutions. It's a complete gamble and relies on too many different components to work, whereas a book you just have to know how to read. The world can be in another dark age and it will still work. At least while there is light out.