Download the free utility available on the Nuix site, Evidence Mover, which will allow you to securely copy files from one location to another. The utility generates hash values for both the source and copied files in order to confirm that the collected evidence is complete. Data transfers will be re-executed until the matching MD5 hash values have been confirmed.
Note the option in this screen grab to perform 'Recursive' copying. When this option is selected both the source folder and any subfolders inside it will be copied as well.
Evidence Mover also generates a log file noting the hash values of the files and providing confirmation that there were found to match.
The modified and created times of the files are also preserved.