An instance of the SQL Server Database Engine from 2008 or later must be available to configure the Power BI Report Server. Each Power BI Report Server instance, such as ATLAS\PBIRS requires both a Report Server Database and a related report server temporary database on the same instance of the database engine. The Report Server Database stores content, such as reports, schedule definitions, folders, data sources, and the credentials for report data sources. The report server temporary database stores cached reports, session and execution data, and work tables generated by the report server.
Both the Report Server Database and the report server temporary databases should be regularly backed up but not modified ...
