The Cloud Storage extension provides the ability to save data to cloud storage services, such as iCloud.

The simple API allows you to quickly integrate saving data to the cloud using the native cloud services on a user's device. The key-value storage allows you to store discrete values in the cloud for app preferences, app configuration, or app state. Key-value storage is similar to the local user defaults database; but values that you place in key-value storage are available to every instance of your app on all of a user’s various devices. If one instance of your app changes a value, the other instances see that change and can use it to update their configuration.

Complete documentation will help you through the integration.