To use Windows Server Backup, you must be a member of the Backup Operators or Administrators group,
or you must have been delegated the appropriate authority.
The Administrator account already has full backup rights, If you are an administrator or a backup
operator in a local group, you can back up any file and folder on the local computer to which the local group applies.
You may refer to the section “Backup Operators Group Overview” in the following article
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