安装新的Android 7.0手机时，我选择从附近设备的副本的选项。旧的Android 4.4设备上的所有应用程序都被复制，似乎是工作，但只有4个实际上有任何数据：Gmail，Calendar，Hoogouts（但不是Hospouts Dialer）和联系人。每个其他应用程序都是一个干净的新安装状态：没有帐户，没有数据，没有保存的游戏等。
When installing a new Android 7.0 phone I chose the option to Copy From Nearby Device. All the apps on the older Android 4.4 device were copied and seem to be working but only 4 actually have any data in them: Gmail, Calendar, Hangouts (but not Hangouts Dialer) and Contacts. Every other app is an a cleanly freshly installed state: No accounts, no data, no saved games, etc.
What happened and how can I correct this? The older device is not rooted and neither is the new one yet (but I intend to do so once I figure out why).
Two possible reasons
When you set up your phone, you can quickly import Google Accounts, backed-up apps, and data from your current Android device to your new Nexus phone by using Tap & Go.
Kit Kat didn't have the cloud backup, IIRC, so it can't be whereas whatever is backed up is Google account stuff
On a side note, transfer from Huawei device on KitKat to Lollipop worked but not KitKat to Marshmallow (personal experience), that's why I was sceptical about it in answering your earlier question