Hello, thanks for the answer.
I have managed to connect each node of our FAS2750 cluster as NDMP Server to Veeam Backu Server after executing the command
system services ndmp modify -node * -clear-text true -user-id ndmpuser
Then the SVM-DR CIFS resources are already associated with node-1 of the cluster and I can add them to Veaam's File to Tape jobs.
Best regards