I installed Sonoma earlier today. First time I logged in to my 2019 MacBook Pro Intel 15 inch after the upgrade, I got a notification that an encrypted disk had an unencrypted backup destination.
I have never asked for nor wanted an encrypted disk, and FileVault is still turned off. All of our iPhone/iPad backups are unencrypted. (Not only do the sync windows say so, I have manually copied readable MP3s and JPGs from the backups.)
I have never created a password or encryption key for such because I have never been asked for one. Nothing in
diskutil list suggests encryption. Nor in Disk Utility.
If there really is an encrypted disk somewhere, how do I find it and how do I unencrypt it?