Hello,
RHEL7 or CentOS are the most common deployments for Nagios XI and fully compatible. We are always recommend clean (nothing else installed), minimal version of the distribution.
We have a guide for step-by-step migration instructions. Also, you'll need to migrate between the same versions of Nagios XI. You can either upgrade to the latest version of Nagios XI on the current system and then migrate or install XI 5.5.5 on the new server and then upgrade XI.
Backing Up and Restoring Nagios XILet us know if you have any questions.
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