Indeed, you're supposed to encrypt the backups with a password. If you don't, some data like wifi passwords won't be backed up, as far as I recall. If they did

Indeed, you're supposed to encrypt the backups with a password. If you don't, some data like wifi passwords won't be backed up, as far as I recall. If they did have backups that were encrypted, FBI could brute force that password too (if it's not just sitting in the keychain).