It can depend on the vendors implementation, but usually they will provide the key in some readable form for the purposes of backup. If they don't, but do use Q

It can depend on the vendors implementation, but usually they will provide the key in some readable form for the purposes of backup. If they don't, but do use QR codes, screen grabbing the QR code may work for the purpose. It is possible however that a vendor can choose to obfuscate the key in an app or through some other method. Technically it's in there somewhere, but may be hard to extract. In the case of this phone however the only way in is to have a key.