Which article are you following? I'm not aware of any Content Control menu item in Confluence, but the steps to export from Confluence Server are as follows:
Can you try that and let me know if you're able to access your backup?
Also please note that if you're importing to a Cloud instance that also has Jira installed, you will not be able to restore using the site backup, and will need to do it one space at a time.
Let me know if you have any questions about any of that.
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