Copying a folder from a Mac to an external hard drive using Terracopy: if you delete the source file does the destination file get deleted too?

When copying a folder from a Mac to a backup external hard drive using Terracopy? If you delete the source file or folder does the destination get deleted too? This happens using Carbon Copy Cloner App. I want to copy pictures from my Mac to an external hard drive. When I am out of space on my Mac, I want to delete some older picture folders/files on my Mac, but I still want the pictures to reside on the backup external drive. I will like the backup to be scheduled everyday. Will Terracopy accomplish this for me or is there a better method or app?