One of our employees accidentally deleted the page in our Spaces. Confluence is in the CLOUD (not on-prem). Is there a way that Attlassian Support team could recover that particular html page ?
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If the page is already purged or not available in your instance, you should request the instance backup from Atlassian. Please keep in mind that they keep the backups for a limited time.
You should then restore the backup in a different instance (or just the space, perhaps). Once restoration is done, you can retrieve the deleted page.