The images of your shared folder are synced to every device connected to your iCloud ID. They stay in iCloud, until you remove them from a folder on one of these devices.This is the error I get. So let's say I make my folders in the shared drive. Now I delete them from the primary photo folder. These images are no longer synced with iCloud and are no longer backed up? I use my pic and iCloud installed on my pic to upload and download my images. With that being said would the app on the computer just not push and reap load the image back to the cloud once it is deleted from the iPhone? Just don't want to loose my images for good.
Photos from your iCloud Photo Library are not backed up, neither in iCloud, nor on iTunes.