USB Backup software?

Is there any software which can manage my USB backups?

Im looking for certain features.. Like the USB must be able to identify only the folders which have changed and copy only those only.. Also maybe whenever i plug in my usb on my PC it can start backing it up automatically in the background?

Something like that.. My USB is 16gb so its very hectic to make backups of it manually cuz it takes a lot of time.

use Vice Versa