Question: Did you buy 2 new servers for the Unity 8 build? If so, you build the Unity 8 primary and get failover running and then the COBRAS import data will be replicated.
Otherwise, when you build your new Unity 8 server the best way to go about things is to rebuild the old server (if you're keeping it) and get it set up with the new Unity 8 primary. Same as what was said above would apply.
If you have to failback, you'lll need to remove subscriber properties again (if the servers are in the same AD domain). You can run COBRAS during production hours...as long as you don't have a HUGE DB (for example, I did this for a client with 5000 users and 50K messages - wouldn't do that during the day). If the system is small or you're not migrating messages, you'll be fine.
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