I would only plug it in when I was using it personally. I haven't used the model you've got, but mine just sits there and spins as long as it's plugged in so that's how I use mine. As a side-effect, if you're using it for data backup and you store it somewhere away from your computer, you'll have it if something goes disasterously wrong in your computer's environment - fire, flood, theft, etc.
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"Act as if the future of the universe depends on what you do, while laughing at yourself for thinking that your actions make any difference."
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