Will the data persist through a major update, such as from iOS 10 to iOS 11? Any reason it might not?
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1If it didn't, millions of users would be screaming about lost data right now. – rmaddy Oct 03 '17 at 14:30
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Clarify your question. Are you asking if data saved via archiving under iOS 10 can be unarchived under iOS 11? Or are you asking if a file saved under iOS 10 will still exist after a user updates to iOS 11? – rmaddy Oct 03 '17 at 14:32
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Yes, the data will persist after an update or a restore/backup as well. It only disappears from the device when the application gets deleted or you erase the app cache (it's possible on a jailbroken device or with iFunBox etc.)

Tamás Sengel
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