This probably shouldn’t be your primary storage, but for an easy and reasonably reliable backup, set up LUKS or Veracrypt encryption on a good, brand name flash drive or SD card and store all your passwords and keys/codes there. You can get almost any password manager to give you a CSV or txt file with all the data in your account. Put the drive somewhere safe and out of the way, not plugged in anywhere.
This probably shouldn’t be your primary storage, but for an easy and reasonably reliable backup, set up LUKS or Veracrypt encryption on a good, brand name flash drive or SD card and store all your passwords and keys/codes there. You can get almost any password manager to give you a CSV or txt file with all the data in your account. Put the drive somewhere safe and out of the way, not plugged in anywhere.
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Imo thats the most comfortable solution. Just be sure to keep multiple such backups (ideally at different locations) and check them regularly.