Cannot visible the files and folder copy by robocopy (It is visible in old machine)

Run the command "ATTRIB -h -s -a d:\backups\c" to remove the hidden of the folder.

To prevent the backup folder being hidden by robocopy:

You can prevent the new directory from becoming hidden by adding the /A-:SH

Reference:

https://stackoverflow.com/questions/6584402/after-robocopy-the-copied-directory-and-files-are-not-visible-on-the-destinatio

https://forums.unraid.net/topic/133277-directory-created-by-robocopy-is-not-visible-in-windows-explorer/