How to keep track of (and possibly reverting) changes to data in native when back?

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I see in https://docs.mendix.com/refguide/native-navigation  4.3 Updating Data It is important to remember that any changes you make to your data will be immediately reflected on all active screens. However, this does not mean that these changes are also committed to the database; that remains an explicit action. Another consequence of this is that your app is responsible for keeping track of (and possibly reverting) changes to data when the user decides to navigate back (for example by pressing the back button) without saving their changes. How to keep track of (and possibly reverting) changes to data in native when back?
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anybody help?

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