Disconnected operation allows you to do the all the usual operations without a connection to the server or the internet. Its very useful for:

1. Remote site work.
2. Secure sites.
3. Travel.

Note that you can add change requests, files, ... etc in our system in contrast to something like GitHub.

% cd project
% fossil sync       # update local and hanges to eds.power.on.net/project
% fossil ui         # start up a browser and webserver just like this one.
... do your changes  
% fossil sync       # when you get back to civilisation