Today I shill an old project of mine, unrelated to Nostr: https://github.com/dtonon/papiro

Papiro is a very simple tool for storing any data in physical form by printing qrcodes on one or more pages. I created it a couple of years ago for a personal need; maybe it can be useful to you too to improve your backup strategy. Try it :)

Why QR Codes on paper?Because paper seems the most resilient and cost-effective storage medium on earth, at least for low volume data, and QR Codes have an interesting error-checking system. So it is a nice backup solution to pair with digital ones.