With SeedSigner, keys are stored in analog fashion because the device itself is engineered not to remember them. Seed words encoded as a QR code make it quicker to activate a key on SeedSigner, but you can also manually enter the words and get the same result. We have a backup solution that combines both a metal backup plate and a QR code (see below). If you'd like to learn more, this may be a good place to start:

https://seedsigner.com/seedsigner-independent-custody-guide/