You can save a project at any time.
You can save a project to a file with another name by clicking "Project->Save As". Save As is useful when you need to save different versions of a project with different modification. In fact, they (these versions) can be treated as different projects with
the GIS data layers in the same directory (GISData). This can save disk space if the majority of the GIS data layers are common to multiple projects.
In the dialog below,specify the name you want to use.
click on "OK" and the program will save the project file(.sip) with the name you specified in the project directory.