share git repositories with dropbox

create a dropbox folder for your repositories:

mkdir -p ~/Dropbox/repositories
cd ~/Dropbox/repositories

create a bare repository:

mkdir new_project.git
cd new_project.git
git --bare init

change the directory to your project:

cd ~/projects/new_project

add dropbox remote to your existing repository:

git remote add dropbox ~/Dropbox/repositories/new_project.git

add your files and push to dropbox:

git push dropbox master