Save bandwidth and time with apt-proxy | SubVS:

If you have more than one box to update or install software with apt on, apt-proxy can save you a lot of time (and bandwidth). It runs on one box, and others are then set up to update through it. Updates are then stored on the apt-proxy box so that any others that also update can do so a lot quicker than getting them from the mirrors. It also releives a bit of the strain on the mirrors you are using.

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Tim Fehlman