Download all installed packages

I need to download all installed packages of my current distribution. I am going to need only packages that either were updated or installed **after** fresh installation. (I prefer not to download packages that were installed by default) ### Motivation I am trying to make a repository of my currently installed packages, and move that repository to another computer which is located in somewhere with unstable radio link (so I can't download the packages). And I know how to make a repository using reprepro and I know how to download packages without installing them. Howewer the problem is to find which packages have been installed or updated. Distribution: Kubuntu 17.10 Package Manager: apt, dpkg