Configure cluster members to be active and standby

I am deploying LXD cluster with 4 nodes. I want 3 members to be active on which the containers should be distributed automatically. I want to configure 4th nodes to be on standby on which I would like to copy critical containers and can be made active in case of failure of any other nodes.
I would appreciate any guidance on how to go about it.

Set scheduler.instance=manual on that 4th server and no instance will be automatically placed on it, only instances copied or launched specifically with --target NAME would.

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Thanks this worked

$ lxc cluster set lxd-host-04 scheduler.instance=manual

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