Hi,
there are some performance issuses.
If you try to backup tons of small files, then use NDMP, cause the Performance of NFS for such cases is realy poor.
In case of large files (such as SAP Backup cache) as we use it for, u can use NFS either.
In generaly the CPUload on the filer for NFS is much higher then for NDMP. If you already have som perfomance issues on the filer, dont use NFS with extraload.
In the view of costsaving, use NFS.