- Open G Cloud App.
- Tap the Menu icon in the upper left corner of the app.
- Open Settings.
- Tap the Automatic Backup option.
- Set Upload files to G Cloud When On schedule.
By default, G Cloud will run the backup while charging your phone and when it is connected to WiFi.
To force G Cloud to run the backup whenever you want, check this article.
This applies only for the Android version of G Cloud.