How is it possible that this error still exists???: https://social.microsoft.com/Forums/en-US/ea80cc53-12fd-4ac3-8e0b-a76cf750fce5/database-backup-access-denied-dynamics-crm-4-workgroup-cannot-attach-documents?forum=crm
Why did you never answer him?
Why is there no other website mentioning this error?
What is the solution for this error?
And yes, the title is your horrible (and only one copiable) output.