Partial or selective backups are error-prone in my opinion and experience.
Given the speed of today's computers and devices, the best solution for backups is a full backup. This method ensures that you have an exact copy of all the sub-directories and their respective files. To eliminate the possibility of underlay (old) directories and files, clear the destination before performing the copy-backup. At the end of the copy-backup, do a DIR of the source and destination to ensure that the size and number of files match.