First, please note that backups in this app are not automatic; they have to be done manually.
On the device that holds the data you want to keep, tap "Create backup data" (or "Overwrite backup" if a backup already exists). Then, on the device you want to transfer the data to, tap "Restore from backup". This syncs the data.
If it doesn't work, please check the following:
- Make sure both devices are signed in with the same Google Account (it is shown under "Google Account" on the Backup screen)
- Make sure you are connected to the internet
- Tap the refresh icon at the top right of the Backup screen to load the latest status
- Tap "Sign out", then sign in again with "Sign in with Google"
- Make sure there is enough free space in your Google Drive
- Make sure the app is updated to the latest version on both devices
- Restart the device and try again
If none of this helps, please tap the "Contact Us" button at the top right of the Help screen and tell us where you get stuck. We'll get back to you with a solution. Thank you.