Before you Analyze your contacts, create a backup or make sure 'Backup before Cleaning' is On under Settings as it will backup contacts automatically every time before you run the analysis.
You can also, create a backup manually, In order to backup manually:
- Tap on 'Backup' on the Home screen.
- On the next screen tap on 'Backup Now', you can also check with the backup contact counts within the backup file post creation a backup.
Important Note: The free app has a limit to save only three backups.