The idea is use own personal storing space on Google Drive as remote database for saving quiz results (for quizzes with up to 60 questions).
As database file is used a spreadsheet in the Google Sheet format.
The prerequisite is a Google account, that is widely spread around world, due to
the Google email service, Gmail.
Google Drive can be found at the following link:
There are two manual steps:
IMPORTANT NOTE: Due too limitation of 256 columns of a Google Docs spreadsheet, can be stored quiz results only for quizzez that have a number of questions less or equal to 60.