May i know the size of the share, How about Robocopy ( Windows ) it would be the ideal option.
Steps Would be:-
1) Create a cifs share in Netapp storage of same size or higher than your windows
2) Map it to a windows machine where the windows file server is accessible
3) Perform a Robocopy from your windows file share to new cifs share
Let me know if any concerns and remeber you copy will be limited by the network link in your environment....
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