System and method

A method implemented in a system including

• a generator that uses renewable energy,
• a battery configured to store electric power supplied from the generator,
• a first communication unit that is powered by the battery and configured to provide an access network,
• a second communication unit that is powered by the battery and configured to connect to a wide area network,
• a server that is powered by the battery,
• a storage unit, and
• a control unit, the method comprising:
• processing, by the server, a predetermined request from one or more terminals through the first communication unit;
• storing, by the server, data received from the one or more terminals in association with the predetermined request;
• and
• when remaining energy of the battery reaches a predetermined threshold, instructing, by the control unit, the server to start uploading of the data stored in the storage unit to a predetermined device through the second communication unit.