First you need to install the windows nfs client. Go to

Control PanelAll Control Panel ItemsPrograms and Features

Then click on Turn Windows features on or off then select NFS Services Client for NFS. After the installation start a dos box or power shell. And enter the following command to mount the share backup on server 192.168.1.1 and assign the drive letter k:

mount \\192.168.1.1\backup k:

Example: mount [options] \\nfs-server\unc-nameshare-name [drive letter]