This command creates a mirror of the specified boot entry. bcdedit /store /mirror { } Specifies the store to be used. If ...

This command creates a mirror of the specified boot entry.

bcdedit [/store ] /mirror {}

          Specifies the store to be used. If this option is not
                    specified, the system store is used. For more information,
                    run "bcdedit /? store".

                Specifies the identifier of the entry to be mirrored.
                    For more information about identifiers, run
                    "bcdedit /? ID".

Example:

The following command creates a mirror of the specified operating system boot
entry:

    bcdedit /mirror {cbd971bf-b7b8-4885-951a-fa03044f5d71}