These applications are used only by their owner and are not available to other people.
With the owner's permission, they read data from the owner's own accounts in order to keep a private backup copy. That copy is stored only on systems the owner controls. It is not shared, sold, or sent to anyone else, and it is not used for advertising or analytics.
Access granted to these applications can be revoked at any time in the settings of the account that granted it (for Google accounts: myaccount.google.com/permissions).
Use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.