The task is the following: the Android device connected to a machine of production in a factory has to forward the collected data to a server. As the card is in mass storage mode its content is visible only to the machine (as if it was a pendrive). We need to forward the data from the SD card to a server.
An application is needed that can access this memory card and copies the data to a server. As the size of the data increases by time, it would be better to forward only the changes. If it is hard or impossible, then you need to solve to copy the data to the server as fast as possible. The machine of production knows only FAT16 so the maximum size is 2GB.