The xcopy command with the /E /H switches is the best choice because /E copies directories and subdirectories, including empty ones, and /H copies hidden and system files as well. While /S also copies directories and subdirectories, it does not include empty directories. The /K switch simply copies attributes, which is not strictly required by the question, and /G allows for copying of encrypted files to a destination that does not support encryption, which is also not required.