So I played around with the Copy & Import function and I really like it's simplicity in use. I was able to get my desired folder structure in no time. Now I noticed that when I import the same files twice, then Darktable will note that files with the same name are already present and simply create new unique file names and import them again. So now I have two copies. Is there a way to tell Darktable to not copy/import if a file with the same name already exists?
When you import a folder, at the top of the selection box there is an option to "Select only new pictures"
Hmm, I don't seem to have such an option in the copy/import dialog:
it only seems to be available in the "add to library" dialog.
I guess it needs to be in the library for such actions to work.