Do you need a mirror path if using local Git repositories?

[Ben ST]

If Review Board is set up to only use local Git repositories, would it ever contact the remote Git server? Do I need to specify the remote URL in the mirror path?

I'm just trying to simplify my configuration to eliminate scope for network and/or authentication issues. In the Repository admin page I have removed the Mirror path, and also the SSH key, and all still seems to work.

Thanks.