Failover - how to setup a secondary BP node

Hello Operators , I need your help.

I currently am one step away from running my pool, but somethings missing… A failover

I gathered some information about running a cluster service, which monitors hosts - the nodes, but i have a few questions about duplicating my BP.

As i know cardano it self has a timer with which it tries to connect to topology list even after it has been run, it updates.
Next is i think what about certification and stake payment addresses and such ?


So if the primary node would stop running how a secondary node can be started?