Whether you have one of the latest Macs, a new iPhone, or another Apple product, iCloud is the built-in cloud service that keeps your data in sync. When enabled, changes you make in a compatible app on macOS Sonoma will also reflect on iOS 17. But while iCloud is available for free to all users, Apple also offers an iCloud+ subscription service for those who want to make more out of it. But what do you get with a monthly payment and is it worth it?