Control-M: 22_NAQ_NONSAP - Event: JOB NOT OK App: LYNX-IS-EP-QA-PQK Job: ORACLE DB ARCHIVES Folder: 9N2QA22_LYN-DATABASE-EP_PRI
inc came after Q4 os patching activity. due to observer node was not started  
after starting observer node backup completed successfully  
hence resolving this incident