backup2 restore app data logic error

[xuemingyang]

Test environment

• 16.7.2
• iPhonX

Describe the bug
1: when i use the command [pymobiledevice3 backup2 restore "D:\backup\b1"]
nothing data restore.
2: when i use the command [pymobiledevice3 backup2 restore --system "D:\backup\b1"]
it can restore system info likes the account info, but app data not restore.
3: when i use the command [pymobiledevice3 backup2 restore --system --source xxxxxxxx "D:\backup\b1"]
two things found:
1: if already installed app, the app data could be resore.
2: if not installed app, the app data could not be restore

so, whether can fix this problem[2: if not installed app, the app data could not be restore], because iTunes and 爱思助手 could restore app data, need not install the app

[doronz88]

Please give concise steps to reproduce

[xuemingyang]

1: install amazon app and login
2: backup
3: restore
4: noting restored

[Lakr233]

This happens if you restore in update mode with the parameters —setting —system —reboot. To restore fully, include the —remove option so the system triggers a migration and all apps download from the App Store. Without the remove parameter, only data for existing apps will be restored.

[Lakr233]

The downside of the parameter —remove is that before the app is downloaded from the App Store via the network, you cannot install it with an IPA file. It’s inconvenient.