In my experience, if you've backed up via Mac then restore to that backup you do get the data that was saved by the apps. As an example, if I backed up my phone with iFiles
(App Store version, not Cydia) that contained certain files and if ever I restore my phone the app along with its data will be restored.
This could depend as per app's setting, some apps have a feature that could allow you NOT to back up its data... Check the app's setting.