Well, that sounds like you will be doing the install to multiple computers? You can do the installation once, install all available upgrades once, and then use remastersys or clonezille to either make a bootable ISO of that fully upgraded installation, or just a clone, that you can install on other computers (so not needing to download the upgrades again).
You can also just copy the installed upgrades from that one machine, and manually upgrade those other machines from that set of packages. The .deb files are kept in cache, in /var/cache/apt/archives. You can copy them from there to those other machines, where you can install them in one go from the directory where you have copied the packages with:
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sudo dpkg -iEG *.deb