This is not that easy with digital media. How can you be sure that you can still read the data after long periods of time?
i can see your point, i might have to reconsider
Some more explanation here: https://bitcoinarmory.com/about/armory-backups-are-forever/
If you don't like Armory (because it needs the full blockchain), I bet Electrum (light client) can do something similar. I just happen to know the links for Armory.
Also make sure you know how to restore your wallet from the paper backup. Some nice writeup on that topic here (https://bitcoinarmory.com/about/using-our-wallet/) in the "I'm Scared" section.