Losing files after update

Hi, I search a way to develop an application that is not losing files created by the app after an update was done. That means a user is changing some settings of the app and after a update of the application the saved changes still exist.
Is that possible and when, which way is the right ?

If you install an updated app over an existing one it preserves the data from the older version. However, it is sometimes useful to allow applications to independently save data to a computer over a local area network. There are many ways to do this, and just about all of them are used by one program or another. Look at AirSharing, iTalk, TravelTracker, EverNote or HanDBase. All of these allow backups of application data, each in their own way. iOwn and EverNote back up over the Internet to their own servers. Travel Tracker uses a utility developed by Hardy Macia called SyncDocs (Contact him on his web site), AirSharing uses a Bonjour connection, iTalk uses its own protocol to a server installed on the desktop.

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