Need program to mirror what goes onto one hard drive, onto another!

Long story short, I have a MacBook Pro, and I have 2 External Hard drives, one is 1TB, and the other 3TB. I need a way to keep everything that goes onto the 1TB mirrored onto the 3TB, and then when I add something to the 1TB, the 3TB also gets it.

Basically I have the 1TB HDD with all my movies on, and the 3TB for all my large video files and photos etc. I want to also have the movies on the 3TB, so when I download a movie to my 1TB, they are also on the 3TB. Is there any way I can do this?
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  1. Best answer
    Just use Time Machine to backup the 1TB drive onto the other one.
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