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When attempting a backup, the transport may inform us that the backend is in an uninitialized state. This typically means that the device's data has been wiped after a period [e.g. 90 days] of inactivity. This means that we need to re-store all data subject to backup, and all of our incremental state tracking on the device is now stale. In response, we wipe all of our recorded backup state and restart the backup pass on all participants.