How are the backup files stored? Are they stored as database files, normal files, or plain text?
CubeBackup does not just store Good Drive files, Gmail messages, Contacts and Calendar data, and Good Sites pages - it also keeps metadata and version histories for files and folders. By default, everything is encrypted, and is not designed to be accessed outside of the application.
Team Drive/Google Drive backups
Each Drive file will be backed up as <fileid_md5> in a subdivided directory, along with any corresponding metadata files. A single Drive file may have multiple metadata files which trace its version history and modifications. Drive directories are also backed up as metadata files.
Google-native Drive files, such as Google Documents, Google Spreadsheets, or Google Slide files, may also have .export files along with their backups.
SQLite database files are used to trace the history versions of the Drive files and folders.
Each Gmail message is backed up as
SQLite database files are used to keep metadata for the Gmail backups.
Google Contacts data is backed up as SQLite files.
Google Calendar events are backed up as SQLite files.
Google Site pages are backed up as files in subdivided directories, along with a few SQLite files to keep history snapshots.
Note: By default, all backed up data, including the SQLite database files, is encrypted. Even an administrator cannot view the contents of the files directly.