New behavior. Backup no longer uses the encryption password. This is in part because that is hard with patterns, in part because it is a security issue - the off line backup is much easier to brute force than the phone. Instead, we simply insist on an encryption password if your device is encrypted and locked. Bug: 17159330 Change-Id: Ia22f84722522abf0b569a3ef1e16ead5527c726d