I do have a (small) network and have reduced bandwidth usage using apt-cacher; the cacher machine is very fast, the client machines are very slow but updates updates go faster fetching from the cacher over LAN. My problem was that space was getting tight in my var partition on the apt-cacher server and the logical candidates for cleanup were .debs for packages that are no longer installed. The problem is exacerbated by the presence of the debs in both the local apt directory (/var/cache/apt/archives) and the apt-cacher packages directory. The apt archives directory is manageable with 'aptitude (auto)clean' but the apt-cacher packages directory just shadows what's available in the distribution, which means it will grow more often than contract.
I guess, for me, it comes down to managing the space local space with aptitude (auto)clean and if things really get tight just clean out both directories and start fresh. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]