Confluence-server and Confluence-cloud are two different products.
You can run Confluence-server on any machine (that meets the requirements for running it) you want to. Whether that server is in your house, in your office under a desk, in your data centre, in someone else's data centre or in "the Cloud" (Which can be oversimplified to "someone else's computer" because while it is technically running on a computer in a data centre, despite the protestations of those who run that joke down, there's usually a lot more going on in the software than just a computer running your stuff)
Confluence Cloud is NOT something you can download and run on "your" own servers. It is a hosted service run by Atlassian for you.
So, the answer is "yes and no". You can take your server instances and move them into "the Cloud" of any form, as long as it can run Confluence. But it remains "Confluence Server". If you want to use "Confluence Cloud", you will buy a subscription from Atlassian, and migrate your data to their systems.
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