I solved already my doubt, i explain it here.
The ndmpcopy is also available in the clustered version only it needs to be enabled.
1)Enable ndmp on the cluster vserver:
vserver services ndmp on -vserver cluster_name
2)Create a user to do the ndmpbackup :
security login create -vserver cluster_name -user-or-group-name backupuser -application ssh –authmethod password -role backup
3)Generate an ndmp password:
vserver services ndmp generate-password -vserver cluster_name -user backupuser
4)ndmpcopy should be ready to use as in 7-mode
Hope that help to someone with the same question.
Regards