Are you suggesting that both keys should be required for decryption?
replyHow would you restore the backup if your secure hardware device is lost/stolen/damaged?
The backup would live someplace other than on the broken machine. It would be encrypted some other way (or maybe not at all, depending on threat profile).
replyNo point in encrypting those family photos burned to disc.
And the owners of the computer can't get the key in the secure enclave? Are they part of the threat model?
reply“Some person with physical access to the computer” absolutely is part of the threat model.
replySome person, yes. The owner, no.
replyThe standard way you distinguish "adversary with physical possession" from "owner" is "do they have the owner's passphrase".
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