We should be thinking about replication from Windows to Netapp .
We cannot use snapmirror for replication between a netapp box and windows box. I think you have realized that one and we do not have native tools on netapp which would help in seemless replication.
Not replication but we can migrate the data using securecopy, F5 migration services or freetool available in windows which is robocopy. these tools will keep the security/NTFS ACLs intact during the migration.
Please let me know if this is not what you are looking for.
Ok. I have got a NetApp filer wich has about 3Tb of shared public folders in primary DC. I need to replicate this data into disaster recovery site in secondary DC. So... nobody asked me how to do this and provided me only windows server... and now I think how to do this task in better way. NetApp to Windows... I think script help me, but, may be, someone already has such experience and know, may be, better way.
I like Robocopy and it is easily scripted. The new version of Robocopy with Windows 7 and Windows 2008 R2 is multi-threaded which can increase your throughput for the large data migration. Check out some documentation on it here.