Ubuntu "lightweight" backup solution

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http://askubuntu.com – What I love on iOS is, system always backs up following things: Applications that you installed (not app itself but link to appstore) Apps' configuration files and saved data Whole system configuration And I've found some similarities with iOS on this system. For ex., both OSs have application centre with app installation queue functionality. I don't want whole system (file by file) backup like Acronis or Norton Ghost does. What I need is, say, my Ubuntu crashed, or just want to refresh installation for some reason. whatever.. I want to install "brand new" system, with "brand new" instal (HowTos)