Sync to iCloud with CKSyncEngine

Discover how CKSyncEngine can help you sync people's CloudKit data to iCloud. Learn how you can reduce the amount of code in your app when you let the system handle scheduling for your sync operations. We'll share how you can automatically benefit from enhanced performance as CloudKit evolves, explore testing for your sync implementation, and more.

Apple dev: wwdc video

https://developer.apple.com/videos/play/wwdc2023/10188/ 

A blog

https://superwall.com/blog/syncing-data-with-cloudkit-in-your-ios-app-using-cksyncengine-and-swift-and-swiftui