I understand that losing the public key doesn't matter cryptographically, which is why I said "it is not technically unrecoverable". Also, the encryption happe

I understand that losing the public key doesn't matter cryptographically, which is why I said "it is not technically unrecoverable". Also, the encryption happens on the server. If you protected the private key with a passphrase from the moment it was created then your data couldn't be encrypted because backblaze would never have access to the key.