[halloleo]

I use calibredb export to create a flat copy of all my books in a Cloud location. I don't want to export all formats, only one format of each book. Some books come in PDFs, some in ePUBS, some in both.

With the --formats option I can restrict to say, only PDFs only, but then I won't get the books which are ePUBs only and vice versa. So how can I tell calibredb export to use the ePUB if it exits, but other formats, if an ePUB cannot be found? I'm thinking of something like Preferred formats...

My current way is to export all formats and then delete the duplicate formats via a script. - Not particularly efficient...