Cloning this repository:

git clone git://gitorious.org/vbox-sync/vbox-sync.git vbox-sync
cd vbox-sync

Add this repository as a remote to an existing local repository:

git remote add vbox-sync git://gitorious.org/vbox-sync/vbox-sync.git
git fetch vbox-sync
git checkout -b my-local-tracking-branch vbox-sync/master_or_other_branch