Hello Friends

its been a very short experience for me with squid i'm under a project where i've to manage a repository of software.
I wish to know how can i copy a file (which is being downloaded by any client ) simultaneously to a folder on machine having squid server. Plz guide me.I've a very limited time left. earlier i'd used wget in a perl script to track the URLs visited by clients from access.log. But now we've been asked not to download the same file twice. But to try to make a copy of that same file on server machine.

Plz suggest some ways to do that.