If you have multiple Debian machines to administer, approx can help you get them updated and upgraded more quickly and using less bandwidth. approx is an archive/proxy server for Debian repositories, fetching packages on demand and caching them locally. This means that you only have to grab the package once for your entire local network: after that, other machines can get it from the approx server.
Install the package on the machine you want to use as a server, via apt-get with sudo apt-get install approx. Once it's installed, edit /etc/approx/approx.conf to set your repository names:
debian http://http.uk.debian.org/debian security http://security.debian.org/debian-security non-us http://non-us.debian.org/debian-non-US
On your client machine, edit /etc/hosts to set localproxy to the IP address of your server:
10.0.0.3 approxThen edit /etc/apt/sources.list to work via the server:
deb http://approx:9999/debian stable main non-free contrib deb-src http://approx:9999/debian etch main non-free contrib deb http://approx:9999/security stable/updates main non-free contrib deb-src http://approx:9999/security etch/updates main contrib non-free deb http://approx:9999/non-us stable main non-free contrib
Finally, restart the approx server with /etc/init.d/approx restart, and run apt-get update on the client machine. Note that initially you may get time-out problems: Try again if you need to. After the first run, subsequent runs should be much faster.