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Re:Extracting Data from an Old iOS App Broken by iOS 14.5 by ascagnel_ on Friday May 28, 2021 @09:34AM (#27315131)
More accurately: do not store your data in a proprietary format. The issue isn't that the app stopped working, the issue is that the app changed from a single-purchase to a subscription model, and the last version of the single-purchase app is no longer supported.

If the data was freely accessible, you could at least pull it out and migrate to an app with a more user-friendly business model.

Re:Extracting Data from an Old iOS App Broken by iOS 14.5 by ihuman on Friday May 28, 2021 @11:01AM (#27316183)
Based on the image at the end of the page, it looks like the app does allow you to export the data in a non-propriety format. The problem was that the app couldn't launch, so the author couldn't export the data.