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You can utilize DR volumes on the second cluster, they will automatically keep restoring the latest backup on the shared backup store (S3 for example) https://longhorn.io/docs/1.2.4/snapshots-and-backups/setup-disaster-recovery-volumes/ So in a failover scenario you would have to activate the DR volumes so they become available for use. It's not yet a full fledged 1 click cluster failover, but scripts can be build around this to help with the failover work.

Thanks for the reply. I will look into DR volumes.