How can I keep back up pictures from my memory card onto my hard drive?

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I regularly have new images in my memory card and keep a back up of it in my PC and then sometimes remove some images from my memory card to free up space. It is very tiring to find and select photos from my memory card which aren’t backed up as there are many sub folders. Is there a software which can help me keep the files in sync easily. I want one which won’t delete files from my hard disk if it finds that I have deleted the Image from my Memory card. That is I want it to just copy new images to its respective subfolder in the hard disk(the folder arrangement is exactly same in hard disk).

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