I bought a 750GB external hard disk a couple months ago. So the first time I copied all my stuff (documents, photos, music ...).
After a while I wanted to update the data in my external disk, but I didn't remember exactly which files did I create, modify or delete since the last update. So I just ended up deleting everything from the external hard disk and coping everything back in.
There has to be a better solution right? Something that acts like a version controller.