ipad will not sync with ibooks on imac after upgrade to Catalina
I am running iOS 13.1.3 on my iPad Pro and Catalina macOS 10.15 (19A602) on my i Mac. For the first time I used the backup facility that is now in Finder. The backup process managed to delete all of the PDFs and documents from my iPad Library except one purchased book and when I select Sync all books with my iPad none get synced from my iMac to the now empty iPad Books Library. So i now have an iPad with none of my 100+ PDF documents on it! I left the device syncing overnight in case it was a bandwidth issue but no change.
The new backup facility is USER HOSTILE. It tells you nothing, gives no indication of the state of the backup process except for a circular indicator in the sidebar entry for the iPad and you can't even stop backup unless you force quit Finder.
There have been a few posts recently about the poor quality of Apple's software but this takes the biscuit.
Any help or advice would be appreciated
iPad Pro 12.9-inch, 2nd Gen, Wi-Fi, Cell