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Upgrade SIEM 10.3 to 11.x. Best practise!

Hello guys and girls.

My situation: I have many rules, configs and big three of clients and I need migrate to 11.x.

And of course, i'm afraid to broke everything.

If there are people who had experience in migrating big SIEM environment to 11.x?

What is the best practice to do it? And what the best I can do to prevent sad story "bad migration" and not lose old production SIEM? 

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After some testing in my lab and production, I will write an update.

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