Copy vagrant box locally

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http://superuser.com – I have a vagrant box running on VirtualBox, and I need to make a copy (with all its existing config and data), so that I can make changes on it without affecting the original. The problem is that my original box came as a file package - the internet connection where I'm working with is extremely slow so someone else copied their vagrant and virtualbox folders to my machine. Thus there is no config.vm.box_url to use. How can I accomplish this? (HowTos)