I am attempting to copy only the new files on one hard drive to another hard drive. I previously made a complete copy of the source drive on the destination, then added a few new files to the source drive. Then I enter the following:
cp -ruv /mnt/Drive1/* /mnt/Drive2
every time I run that command it copies everything on Drive1 to Drive2, as I understand the cp command the -u option should only copy files from the source that are newer than files with the same name on the destination.