There is DiskKeeper on the server but I don't know if its classed as a "new" version since it's 2010? Apparently there's no encryption software.

I'll ask the Windows team about third party encryption. Thanks for the article although the solution isn't helpful in this case. But I'll keep a note of it in case the issue occurs again on a server where I'm able to manually create snapshots.

Would I need to tell them to disable diskkeeper for the duration of dbcc check?