I don't know much about windows NFS. But can you manually write to the /mnt/backups after you do this
mount -t nfs 10.10.1.66:/TasIntra01/Backup /mnt/backups
If you cannot, then the script will not work.
If you can and the file is visible via windows explorer then the script will work.
Else check this link:
Note: Like I said, I do not know much about NFS, i just googled to get that link.