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 do not need to install again.
(App to SD or USB OTG) external storage device that is internal storage device
LetsGoApp can archive and info App is moved to SD or USB OTG, and executed in SD or OTG
When replacing ANDROID device, you can still use LetsGoApp execution App on the SD or OTG without the need to re-install and download.
LetsGoApp is aimed at solving the problem of insufficient memory space and data backup.