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Normally we have backup apps which are used to backup any app after installed that,but whereas now I have idea that just after installed from playstore our app will ask us that "do you want backup apk for this app?" that depends on our choice ,and normally we can backup at any time if we want ,in case we didn't backup the app and now we are uninstalling then we have lost chance to backup so now it will also ask "do you want backup apk ?", just before we press 'ok' to uninstall.