For added redundancy DNSBOX can be deployed with a failover unit. This is deployed in a standby mode and configured to synchronize data from the active master. In the event of the active server failing, the failover is restarted in active mode and starts to respond to zone transfer requests and name queries.
When the original active machine becomes available again, it is placed in standby mode until the data has been fully synchronized back. Both machines are then restarted and their modes reversed.

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