The cloud-based storage systems can interact with the desktop in two ways. first by synchronization which is how Dropbox operates. The second way is how iCloud works .the data are stored on cloud servers but you can use a local drive to get access to the files in the cloud. However, the data on the local system can be excluded without modifying the one on the cloud. iCloud Drive supports you access the files on iCloud. Most of the time this feature protects the data on your computer from loss and keep storage on your computer as well. But, few find this doesn't save space, the photos also files are yet containing a large area of their computers.