[seusscat]

Paper. As another poster here mentioned, in case of emergencies paper is the only reliable medium. I have two files of medical records that are chronologically ordered. When I need to go to a new doctor, I just pick up the relevant file and go; hand it over to them and let them scan whatever history they want into their system.

For ease of finding records personally, I have also scanned all of those documents and stored them in a self hosted instance of paperless-ngx along with a standard 1-2-3 backup strategy. In case something happens to the physical file, I should be able to recover the information pretty quickly