Does CubeBackup work through official Google APIs or through some other method?

data is secure

Google APIs only

All communication with Google’s servers is done through official Google APIs, including Google Drive API, Gmail API, GSuite Admin SDK, Google Calendar API, Google People API, and Google Sites API.

CubeBackup uses OAuth authentication over HTTPS both to fetch G Suite data and store it locally, and to restore it to the cloud again. More information is available from Google Developers.

Network communication

All communication is strictly between your backup server and the Google cloud using HTTPS protocol. No data is routed through our servers or any third party.

Local SQLite files are used to track folder and file revision histories, so that only changes to your files are downloaded, much like GIT.