Backup files on paper.
PapUp is a project, that aims at creating a well defined standard for printing files on one ore multiple sheets of paper, and reading them back into a computer. A reference implementation in python using open software is part of the project.
File printouts are meant as secure long time storage for small to medium files. No specialised equipment is necessary to read the data back in, only a scanner or a similar optical input device. Devices of that nature are likely to exist 50 years from now. Keeping the knowledge of how to read the printouts alive for such a long period of time is a hard challenge. Any proprietary piece of software trying to achieve this seems doomed to get lost in oblivion within the first decade or two. Only an open standard that defines the method printing distinctly and without unclarity can hope to survive that long a time.
This is still in a very basic state and to be a prove of concept. Hence, no license has been selected, yet, since I'm not sure about all the implications of the different licenses.
If you are interested in using this work, or if you are willing to help in the process of developing it, feel free to create an issue in github under https://github.com/kratenko/papup/issues