Local cache of updates, installed programs in Ubuntu

[JayLinux]

Using Ubuntu 9.04 (32-bit version)

Is it possible to have a local cache/ "repository" of all -

1) Updates (Critical, Security, Bug-fixes),  and
2) Additional installed deb's (that were installed through Synaptic/
additional third-party repo's) e.g. Opera, Adobe Reader, VLC Player, Google
repo, etc. so that I do not have to download all those again to re-install
those applications in case of a system problem.

In Fedora, there is the yum-plugin-local (
http://www.rpmfind.net/linux/RPM/fedora/devel/i386/yum-plugin-local-1.1.26-1.fc13.noarch.html)
that can do this:

When this plugin is installed it will automatically copy all downloaded
> packages
> to a repository on the local filesystem, and (re)build that repository.
> This
> means that anything you've downloaded will always exist, even if the
> original
> repo. removes it (and can thus. be reinstalled/downgraded/etc.).
>

Is there something similar in Debian/Ubuntu, so that I can keep the .deb
packages of updates/additional programs locally ?

Thanks,

Jay

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