Apple has a way to encrypt sensitive data locally and store to iCloud, then de-encrypt it locally later. They are kind of hit-and-miss with when they do this. But they certainly can do it, so it should be possible to securely back up a voice profile.
FaceID is not backed up to iCloud. That is in part because it is a local-only feature. And it is in part because people’s faces change over time, so requiring them to re-enroll their face with each new phone ensures accuracy over time.
It may also be sensor-dependent; the model produced and stored by an iPhone 14 might not “make sense” to an iPhone 16, if the hardware is different.
True, but they have made choices of where they will and will not do this in the past.
I can see the privacy reasons not to have this data sync, but given the reasons you would be doing it in the first place the risk of loosing those recordings or the data for the voice would be a huge risk.
I don't doubt that Apple could sync this data, I just hope that they are. I don't see anything about that happening on this document so I worry that they won't for privacy concerns.
FaceID is not backed up to iCloud. That is in part because it is a local-only feature. And it is in part because people’s faces change over time, so requiring them to re-enroll their face with each new phone ensures accuracy over time.
It may also be sensor-dependent; the model produced and stored by an iPhone 14 might not “make sense” to an iPhone 16, if the hardware is different.