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Data persistence

In the getting started docs there’s mention that data persistence isn’t guaranteed in the Tangle as nodes can prune transactions from their local databases. With this in mind, how do the proposed use cases for digital identity and the PoC app like Selv persist data? I’m imagining a situation where identities could be pruned and lost and a digital identity destroyed if a node decides to prune the transactions. Am I missing something or there a workaround for ensuring data in the tangle persists?
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