I am confused over the optimized storage function in macOS Sierra and hoping someone here can help me. It is not about the "optimize storage" command in the storage options, but about the option "Storage optimization"in the icloud-settings with the checkmark. This option seems to have 2 different effects: 1: A local copy of all my iCloud Drive data is stored on my internal harddrive. 2: Old files (?) from my Harddrive get automatically moved from my internal harddrive to my icloud drive if my local harddrive has low capacity. Is this right? While i want to have the first effect, i absolutely do not want the second. So i ask myself the following: 1: If i uncheck this option, do i lose the capability to include icloud drive files in my TM Backups, as they arent stored local anymore? 2: Is there a possibility to have effect "1" without effect "2"? 3: If i leave the option active, "who" is deciding which files are "old" or that my internal storage is low. An algorithm? Will i get a notification if it starts to move my files? I hope someone can help me. I really dont understand why such different mechanics are bundled into one option.