Create an offline backup of installed packages in linux

All i wanted was to be able to backup all the installed packages in my linux machine. So that i could use it in future. Obviously my intention was to create a removable repository which could be used on other computers(including mine in case i have to format my machine). Frankly, i was tired of downloading each packages, even codes, after fresh installation of ubuntu every time. I came across this handy tool called APTonCD. This tool allows to create CDs/DVDs with all of the packages that you have downloaded with apt-get/Synaptic. Here's what i did;

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I could see lots of linux users[few days ago i was too] searching for linux packages who often don't have internet connection or have slow connection. This could be of great help for them.
There are still more things you can do with it! Explore!! Better try it once :)