Does the file copy using "robocopy" or "securecopy" sound reasonable to you ? OSSV is one way of copying the data to the NetApp systems, these other ones are the simple copy/migration tools for the files while preserving the permissions.
I would recommend too using robocopy because I have used this in very big setups and they work so seemless that it's hard to ignore them, free and with full dashboard to tune every parameter you may want...