Any local machine may be problematic (if you have a dynamic IP), but git is really easy to host on a VPS or any box with a static IP -- just make sure you have everyone's SSH keys authorized (not on root unless you trust everyone with that), and use the following:

    $ git remote add origin2 user@your-ip:/path/to/repo.git

To create repo.git:

    $ mkdir repo.git  
    $ cd repo.git  
    $ git --bare init