Default [Question] How to Backup an APK with App data in it

Can anyone please tell the process to backup app data into apk. This question already asked in this site but no one tell the whole process.
Originally Posted by whiper View Post
Is it possible to create an apk from an app which includes the data/data/app directory from an backup?
I want to backup an app including data (on a rooted device) and i want to restore this app on a non-rooted device.
Accessing data/data without root is not possible. Can i include the data/data/app files in the existing apk so this data is installed when installing an app? I've got apktool and can recompile an app.