I guess my mistake is assuming EVERYONE has more than one computer to "read" PDF files on a backup.

like having more than one television or more than one phone.
I couldn't live with only
one computer. Good grief...
one computer. What would I play solitaire on when I'm rendering a huge file?
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p.s. Regarding the 20% chance for living in the Matrix. It makes sense.
If some advanced intelligence creates a virtual world of "electronic" creatures like us, potentially there could be many many many more virtual people than real people. The odds are in favor of the fact that there is a very good chance we are MORE LIKELY to be virtual than real.
Choices:
1. We aren't virtual. We are real
2. It is very likely WE will create REAL LIVING virtual beings in the near future
3. Advance intelligence older than "us" has already done this.
4. it is very likely we are virtual creatures in a matrix.
Something around... like... um... near... 20%.
Just think... we could be some 4th graders science class experiment. Or a bunch of characters in "The Sims XPCSMX Pro v456.7.
I strongly recommend the movie "The 13th Floor". It was made before "the Matrix" and speaks to this. Amazingly fun and freaky movie.
-vern