The SQL database that you selected is already configured for NPS SQL Logging. If you select Rebuild, NPS will delete your ...

The SQL database that you selected is already configured for NPS SQL Logging. If you select Rebuild, NPS will delete your NPS database configuration -  including your tables and data - and create a new configuration and new tables. If you select Keep Existing, the existing database configuration will be modified, but your tables and data will remain intact.