You can have a look at Atlassian Infrastructure pages, it will give you a hint of the locations where your data could be stored once you get a Cloud Instance. However just as @Nic Brough _Adaptavist_ mentioned, these regions are auto selected based on where you initially registered the instance.
We’re excited to introduce external collaboration for Confluence, now available in early access. It is available to preview for Confluence Cloud Premium and Enterprise customers. (If you're not on ...
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