On Android, Sygic GPS Navigation uses the Dropbox service to back up and restore stored data. To use this service, you need to register for Dropbox and then connect your account via the Sygic app > Menu > Settings > Backup and Restore.
The following items are backed up: App settings, Favorite places, Favorite routes, and history.
On iOS, you can only back up your data using iCloud. In case of reinstalling, or if you change your device to a newer or different iOS device, just enable this backup option, and your favorites will be safely stored and automatically restored.