iOS Apps and data survivability
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Sandboxed applications have certain document folders where they can keep data such as plists and sqlite files. Those folders are resistant to upgrade, meaning -- when you upgrade the app from the app store, the data will not get reset.

However, when you remove the app, all local data is removed? isn't it? is there a way to persist it beyond application deletion? so that if you re-install, you just get your old data back?