1) In a first stage you simply select what items (= directories) have to be copied and what destination root you will use. In most cases there will be only one directory tree to be copied but you can select also more than one! These are combined into one PROJECT-file (.ond-file).
2) In the second stage (=copy), you choose to run the project-file and following happens:
A) cleaning (except if project is run for first time): it checks every folder on the destination which were eventually cleaned on the source and these are now also deleted in the destination.
B) updating: all new folders from the source are copied to the destination using the same directory structure as in the source.
In this way, during the first run of a project to a disk you will create an identical copy of the source and during other runs to that same disk you update or synchronize that identical copy!

If you have a lot of folders you can also make several projects. As all the project-files are saved you can quickly select them later on again to update the copy, leaving away the first stage.
It is also possible to edit projects later on (eg you want to add a directory).


From v2.0 onwards it is also possible to work with Windows Explorer!
You first enable Explorer in the program and then you can right-click in Explorer to 'OnlyDirCopy' and 'OnlyDirPaste'. See Working with Explorer!