Tks for the reply, your right re terminology, I should have used snap copy.
I will look up the proxy and setup a config to try to sell this to our DBA's.
This is a hoary old chestnut. NDMP was created by Netapp as a solution to backup large fs of small files when they realized doing a traditional tree walk of files was not a runner. So they created a process which takes a snapshot, and depending on how NDMP is setup, either streams the raw data to tape and the metadata to commvault.
This issue is NDMP while taken on by other NAS vendors, is
1. not truely neutral ( try restoring an Netapp NDMP backup to an EMC target )
2. you cannot 'backup forever', you still need fulls.
3. other than a netapp specific extension, its not checkpointed, so if a NDMP backup fails, it has to restart from the start unless you are running netapp.
All the above makes it unsatisfactory, so plan B is intellisnap, but getting a clear picture of implementation is difficult to get from any source :(