I am amazed how apple smoothly handles backup & restore application data. Does apple have any guidelines for backup / restore principles? How does applications handle version compatibility of restored data in between different versions of the same app.
iOS Backup – Where Are Backup Restore App Data Guidelines?
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Best Answer
iOS Data Storage Guidelines
See Apple's iOS Data Storage Guidelines as a starting point. This documentation is written for developers of iOS applications:
See also the Core Data in iCloud documentation.