react-native-background-geolocation ("The Plugin") does not upload any information to third-party services. The plugin's HTTP Service will upload recorded locations only to the host you configure with Config.url option.
The Plugin automatically destroys locally recorded locations in its SQLite database which have not yet been uploaded to your configured url after a period of #maxDaysToPersist.
If you have configured the plugin with an url to your server, the plugin automatically destroys each locally persisted location in its SQLite database when your server returns a success response (eg: 200).
For more information, see the HTTP Guide.