This is one of those questions where the word "cloud" is not defined and probably a terrible way to think of things.
There is only one baseline JIRA application available really, and what you need to consider is who hosts it and how. Your options are:
So, the question is really "what do you actually mean by 'Cloud'?". There's plenty of options and variations available, it's worth thinking through what you want to end up with - where it runs, level of accessibility and who supports it.
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