A simple solution:
#Macro: Title, Clean & Copy Src, ide://run?File=%WINDIR%\System32\Robocopy.exe&args=src&args=..\SavedSrc&args=/MIR&CleanProject=True
It will copy Objects\Src to MySrc folder and then clean the project.
You can remove the /MIR flag and it will then only copy files. With the /MIR flag it deletes files that no longer exist. The downside is that if the Src folder is empty it will also delete MySrc files.