Apt Backup Question

[CB]

Matt Zimmerman wrote:

> 
> Or are you talking about security updates?  I'm fairly confident that there
> aren't quite 400+MB of updates yet.  We have discussed the idea of making
> security update CDs available for download, but so far there has been no
> pressing need.
> 
> What I do personally is use a caching proxy server (squid), slightly tuned
> for downloading packages, so that they are generally only downloaded once
> from the Internet, and served to many local machines through the proxy.
> 

How do you tune squid for downloading packages, out of interest?