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How to Backup any Installed Apps in any Android smartphones or tablets ?
APK Backup & Restore Preview
How to use ADB to backup Android app (apk) + data
App Backup & Restore
How to Extract the APK File of an Android Application or Game
APK BACKUP - SHARE ( APK Extractor)
5 Best Free Backup and Restore Apps for Android | Guiding Tech
How to extract and restore a app/apk from a nandroid backup on many different devices.