[koollman]

You don't have to run it a entire duplicate of your current infrastructure, just plan for it to happen (depending on impact to your business). Then it means you can think about doing it after a few days of downtime, maybe earlier depending on difficulty/impact.

But, yes, you do have to plan to run it elsewhere and consider wether various features may make it harder for you to move on. vendor lock-in is a known business risk