App2SD or USB-OTG (External storage can also be an internal storage)
This idea from storage shortage and backup.
You can copy Apps in your device through LetsGoApp to SD or USB.
Then you can move SD card or USB from this device to another device.
You can execute Apps in new device and don't need to install again.
WebSite : http://letsgoapp.net
LetsGoApp App 2 SD or OTG※ROOT Screenshots