Index migration

hi

i need to migrate several TBs of static index data from W2K3 server with SAN over to W2K8 server with NAS storage. At the moment I am leaning towards robocopy to do the job. I was wondering if anyone had any other suggestions?

As per usual i need the easiest and cheapest solution.

Ideally i want to be able to run in multiple threads to speed up the data copy process.

Thanks in advance!