> When NDMP incremental/level backups are fired, the NAS appliance identifies 
> the changed blocks on the volume and ships the blocks to the NDMP target. 
> This is different from conventional incrementals where only the changed files 
> are backed up.
> 
> As I understand, the only way to achieve NDMP incrementals is through 
> NDMPCopy for inter Netapp filer copies. NDMPCopy walks the filesystem, 
> identifies the changes and backs up only the changed files. 



NDMPCopy is not a software on the filer.  The ndmpcopy command is a utility 
that you install on a UNIX host and "enables a filer administrator to transfer 
file system data between filers that support NDMP v3 or v4 and the UNIX file 
system (UFS) dump format."
[url]
http://www.computeranddata.com/doc/vendors/netapp/6.4.1/ontap/dpg/ndmp12.htm[/url]

Since NDMPcopy is not running on the filer itself, then how do you expect 
NetWorker's nsrndmp_save to invoke it?

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