This is a very, very, very bad idea. Just encrypt your phone with a strong passcode and backup regularly. Making your phone entirely dependent on a strong internet connection is a recipe for a bad time.
I agree that the phone should be encrypted (in conjunction with aind), but people are likely to set weak passcode like "1234" (or finger pattern) because they want to open email/phone/twitter/maps/payment apps in a few seconds.
aind is expected to be used only for sensitive apps, with more strong passcode.