I have iCloud Photo Library set to store originals on my Mac's Photos app. I did a clean install of 10.11 and copied the iCloud Photo Library from my Time Machine backup (300 GB) before I launched Photos on 10.11. I assumed it would just download any photos taken since the backup. Now it appears to be trying to upload the entire 300 GB! All of these photos are already in iCloud. Did I do something wrong?