Local only desktop/laptop - Allows a single instance on a desktop and will save the notes locally on that desktop.
Server with web only access - Installs the application on the server and allows access from any web browser on any device, including mobile.
Combination of server and desktop/laptop - Install the application on both a server, for web access and data synchronization, and desktop instance(s). This allows all the data to be stored on the server and either accessed from the web browser, or the desktop application. The desktop application will sync and store the data locally so that it can be used when offline.