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Separate client and server. Failover like that would be hard. The next best thing would be to have a backup server with a well-known name.
I'd suggesting using SRV records to automatically pick the "best" server with a given name. If one goes down, you reconnect, find the best one down, and connect to the next one in the list. But this could also be done with a separate "backup server" setting in the client.
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