|You must have Read or Modify permission for the site security object class or instance to perform this procedure.|
How to back up a primary site
In the Configuration Manager console, navigate to System Center Configuration Manager / Site Database / Site Management / <site name> / Site Settings / Site Maintenance / Tasks.
Right-click the Backup Site Server task, and click Properties.
Specify the backup task properties, and click OK. Ensure that you schedule the backup task to run at an appropriate time.