https://medium.com/stanford-magazine/carbon-and-the-cloud-d6f481b79dfe
How much energy is used in saving to the cloud? That’s a complicated question. It takes energy to get the data to the data center — miles of fiber optic cables, studded with other fixtures of internet infrastructure that all require power along the way. At the center, your data is stored multiple times on hard disks, and the constant activity of all those disks creates a lot of heat, which necessitates energy-intensive air conditioners to protect the equipment from overheating.
