This will work out of the box on a fresh cloud9 workspace using the following commands:

apt-get install -y mongodb-org

mongod --smallfiles --syslog --fork

npm install

npm start

Your files and such are hosted at https://projectname-username.c9users.io

If your server was shut down then before starting mongod do:

rm /data/db/mongod.lock

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For quick Backbone Intro start with:

hero.js then view.js then multipage.js then create your own ToDo list App