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This directory is synchronized with i Cloud by the operating system, and the Core Data framework writes local changes to i Cloud and merges the changes received from i Cloud, with the local database.It is recommended to use the SQLite database to sync via i Cloud Core Data, as it helps to minimize data transfer over the network by sending incremental changes.Datastore API is not just a synchronization framework, it implements all aspects of data storing and retrieval, replacing Core Data in essence.It means that to enable interoperability between the Datastore API and any other storage system already supported by the application, extra effort is needed.
In the Dropbox Developers Blog you can find lots of interesting information about the Datastore API, with a detailed description of algorithms used in it.For more details on these features please refer to i Cloud documentation, section Testing and Debugging Your i Cloud App.Benefits of i Cloud: Having identified the developers’ need to synchronize their existing structured data, Dropbox offered its service and API for this.Core Data Sync runs on top of the same technology as document syncing.The application has access to a special directory which is separate from the app’s sandbox, where it can store data.
If you choose to use Datastore API only, you would be locked-in to a single syncing system and give no choice to your users. It mirrors the Core Data database to Datastore API and vice versa.