Use
Offline backup with Microsoft Cluster Server (MSCS) is not possible using the DBA Planning Calendar in the Computer Center Management System (CCMS), that is, with transaction DB13. The problem is that BRBACKUP calls SVRMGR to stop the database, but SQLPLUS is not allowed in the MSCS environment.
For more information about using Oracle Fail Safe to stop the database, see SAP Note 378648.