How to replace each type of overcloud node?

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Issue

How to replace each kind of overcloud node?
How to replace the following node roles: controller, block storage, object storage, ceph storage?
To satisfy backup and restore procedures for an OpenStack cloud in production, how to replace each kind of overcloud node?
How to replace a compute node? A controller node? An object storage node? A ceph storage node?

Environment

Red Hat OpenStack Platform 7.0
Red Hat OpenStack Platform 8.0

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