To resolve this issue perform one of these actions: 1) Migrate the datasource to use different volumes using MigrateDatasourceDataFromDPM.ps1. ...

To resolve this issue perform one of these actions: 
 1) Migrate the datasource to use different volumes using MigrateDatasourceDataFromDPM.ps1. For more information, see Using MigrateDatasourceDataFromDPM (http://go.microsoft.com/fwlink/?LinkId=184559) OR
 2) Use a different DPM server to protect this datasource.