[Quoth]

If the ebooks are already on the Kindle:
Copy the visible Kindle Directory with ebooks to a place called authors-books (or whatever).

Then in Calibre "Add books" -> "Add from folders and subfolders"

Adding direct from the Kindle is not a great idea and not that amount either.


If the ebooks are not already on the Kindle where are they? If on a website/cloud copy to a folder on PC first then in Calibre "Add books" -> "Add from folders and subfolders"

Don't add to Calibre direct from share/cloud/web.