jared275 wrote:
In the normal computer world, if you had access to my device, then you should be able to access all the data on it.
If I had your device there's no way I'm getting any information out of it without your passcode or finger. Sure there are tools out there to hack into the device, but not available to the average dirtbag. Without your passcode or fingerprint, no one's getting in. However, your computer may or may not have the same level of access restriction, hence the option to encrypt the computer's copy of your backup.
jared275 wrote:
The Apple iTunes user interface makes no mention that it is making my device inaccessible when I encrypt a local backup stored on my computer, therefore Apple is clearly in the wrong, UX-wise.
In the normal computer world, if I make a backup of something, and encrypt that backup, that does not lock me out of whatever I encrypted. That would be bizarre. Yet here we are.
Apple doesn't need to mention anything because it is quite evident that applying encryption requires you to remember the password (hence the requirement to verify the password you chose when you set it).
You seem to be confused ... encrypting your backup does not make your device inaccessible or locked out for normal use. The only time you're "locked out" is if you erase your device for some reason, then try to install the encrypted backup without knowing the password. Other than that you have free use of your device with or without your backup's password.
Your computer analogy does not apply to this scenario at all ... name a situation "in the normal computer world" where if you password-protect some information that you still have the ability to access the same (protected) information without the password. In some computer situations there are password recovery options, but not in situations where you, the user, assign and administer the password yourself.