I just convert it to QR code using some open source QR code generator and of course, I've run it offline and save it as a PDF file then encrypt it with a strong password, then upload it on some trusted app online, I will not store it on a paper since there are possibilities that this paper will lose including some important files when something happens like a typhoon or some disaster (just in case) since I'm living here in a tropical region/country so I just uploaded it online and I feel it's safe there.
You should upload to different servers so your backup won't be lost in case one is down and a few paper backups, in case all servers are gone (unlikely) or if you forgot your password. IMO, an encrypted backup is good, but you should use a password which you won't forget and not some "hard-to-crack password which is hard to remember. Forgetting your password is the last thing you want to happen when backing up an important file.