Is it even possible? I have hundreds of books in all these formats sitting in my iBooks library on my Mac. Now, I do notice that I can safely delete my iBooks (purchased off iBooks Store) from my local library and the titles still show in my list, with a little cloud icon saying the book is still available for download off iCloud. Is there any way to do the same for books in other formats, i.e. PDF and ePub? I would love to move my entire library to iCloud and free up local space if this were possible.