[Sirtel]

Originally Posted by Patrick Derwael

Second question: with time, I will be adding new FILES to the library directory tree and I will be wanting to do a full refresh
Again, how do I do this without loosing the metadata updates already done and without duplicating everything, "as per the rules"

Thanks!

That's the one thing you absolutely MUST NOT do. Add the books via the Calibre interface, as explained in a previous post. If you don't want duplicates cluttering your PC, then you either have to delete the original files or store them somewhere else (for example, an external drive) for back-up.