Is there a way I can check how much disk space I have utilized across board?
And is there individual disk space allocated for JIRA and Confluence or is it shared in cloud based solution?
I'm afraid you can't do this yet. Atlassian have a request open for "show me how much of my 25Gb I have used", but you can't see it.
If you're concerned about going over your 25Gb limit, raise a request at https://support.atlassian.com and they can tell you how close you are.
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