VBScript To Check Hard Disk Space Available on Network Servers

I need a vbscript to check on various servers (server1, server2, server3, server4) to see what hard disk space they have available and report the answer back to a text file (G:\Reports\DiskSpace.txt). The script will be run from a monitoring PC on the network with UNC access to all 4 servers.

This file needs to keep the previous 7 days data, so the file would look a bit like the following:

** Start of text file **
Report as at 02/03/2005 07:00
server1 = 3,000mb
server2 = 4,000mb
server3 = 5,000mb
server4 = 2,000mb

Report as at 01/02/2005 07:00
server1 = 3,000mb
server2 = 4,000mb
server3 = 5,000mb
server4 = 2,000mb

** End of text file **

Hope someone can help me!

Regards
Richard