Active Directory backup partially successful

I have recently moved the Active Directory backups from a windows Netbackup media server to a Netbackup appliance Media server

The policy type is MS-Windows and have enabled granular recovery with the backup selection as System State: \

 

We have 12 different DC,s in the policy as clients . We however have 6 of them partially successful when backing up to the appliance

 

17/03/2015 02:00:31 - Info bptm(pid=21311) backup child process is pid 21592      

17/03/2015 02:01:31 - Error bpbrm(pid=21159) from client dom40: ERR - Unable to NFS mount the required file system.

17/03/2015 02:08:23 - Error bpbrm(pid=21159) from client dom40: ERR - Error encountered while attempting to get additional files for System State:\

17/03/2015 02:09:45 - Info bptm(pid=21311) waited for full buffer 4863 times, delayed 30416 times   

17/03/2015 02:09:47 - Info bptm(pid=21311) EXITING with status 0 <----------       

17/03/2015 02:09:48 - Info bak01(pid=21311) StorageServer=PureDisk:bak01; Report=PDDO Stats for (bak01): scanned: 15574123 KB, CR sent: 265999 KB, CR sent over FC: 0 KB, dedup: 98.3%, cache hits: 171698 (95.8%)

17/03/2015 02:09:48 - Info bpbrm(pid=21159) validating image for client dom40       

17/03/2015 02:09:49 - Info bpbkar(pid=10600) done. status: 1: the requested operation was partially successful   

17/03/2015 02:09:49 - end writing; write time: 0:09:19

the requested operation was partially successful(1)

The job was successfully completed, but some files may have been busy or inaccessible. See the problems report or the client's logs for more details.