Swapping out which photos are in 20Gb Cloud backup

I'm interested in knowing if it's easy to swap out which photos are stored in the cloud backup. For example, I'd like to upload the photos from one shoot (so I can work on them from two different computers/locations). But the next day, I might want to swap the photos that are in the cloud for another folder of images. Can the photos stored in the cloud be easily swapped? Thank you