How Finder works with your iCloud account (Apple ID): When your Mac is signed into iCloud with your Apple ID, files stored on your iCloud servers (in Data Centres) are synced to the computer’s hard disk. When connected to the internet and in iCloud in Finder, every new file or folder that you add is automatically uploaded to the remote iCloud server. This way your files (letters, photos etc.) are always backed up and you can access your folders and files from any browser (Chrome or Safari) when you sign into iCloud at icloud.com and also add them to a new Mac
