Ive lost numerous images/video's so far because of this. normally on my windows machine, I can copy/cut a folder from say the computer hard drive and paste it on my portable hard drive as a backup. It will ask me if i would like to overwrite the folder with the new folder. As i have hundreds of folders in there, its easier to just copy the folder. However if on my hard drive I've deleted the last batch of images as I've backed them up. i tend to just copy the folder and replace the folder on my portable drive. this completely erases all the files and replaces them with the folder and files inside from my computer when i selected the copy/move option. All i want to do is select a folder and copy it to my portable, without it deleting any files that are in the folder of the portable. WHAT DO I DO?. i only have 2 options, 'STOP' & 'REPLACE'