Rebuild updated project - which is the correct procedure

What is the best method to rebuild updated project?
I did this:
Build developer editor, build developer server. Than I build project with UE4 editor.
Now I need to update everything (rebuild). I click on Generate VS project files, and click on rebuild for dedicated server (developer server). But I got the same .exe as before (even I wait again 20-30 min).
So, do I need to rebuild everytime everything (also for Project and server) or it will automatically update package (it will rebuild only modifications)?
Currently, it’s not for patching, but for testing for developers and testers, so I need simply to update dedicated server .exe file and also project files.
Should I delete some folder and than rebuild?
How you do this?