How can I sync 2 USB drives

Hi there,
I have 2 USB HHDD.
the first is where I keep all my videos and I bought the second one for backing up the first from time to time.
The question is. what's the more efficient way to do it? because I can copy the first to the second the first time, but it takes ages (1TB) so I'd like to use something that will only update the differences. 
Anybody knows how I can do it?
thanks in advance
regards

SyncTwoFolder App. Google for it. Or maybe Mac App Store.
But doing what you want will be SLOW as more then likely they are USB 2 drives. Depending on how much data is on the drives and what has to be Synced, it could take hours or most of a day+.

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