I wish Erel adds a Save As in the file menu of B4X.. currently I see only export to zip. If I am missing something please point me.
Save As is important because you want to make modifications to current project but you also want to keep it. Export to ZIP file
is good for archiving or sending the project to someone.
Most projects are made of many files. A Save As feature isn't really suitable for such projects. Export as zip, or in B4XPages the comment link at the top of B4XMainPage, provide a better solution for keeping a copy of the project.