I've run with two hard drives of equal capacity for around 8 years. For a while these were stored on a linux box. Every once in a while I'd simply run a cp with update to basically move only changed/new files. This saved me many times. These days I have 1 internal 1TB HD and 1 external 1TB HD in my Windows desktop. I'm eventually going to purchase a third external 1TB HD and swap it out in my safe deposit box at my bank. Luckily, my bank is across the street, so swapping that will be no problem and take very little time. I don't plan to do this once a week...maybe once every 4-5 weeks. The odds of a hard drive crash are probably greater than my apartment burning down anyway.
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I've run with two hard drives of equal capacity for around 8 years. For a while these were stored on a linux box. Every once in a while I'd simply run a cp with update to basically move only changed/new files. This saved me many times. These days I have 1 internal 1TB HD and 1 external 1TB HD in my Windows desktop. I'm eventually going to purchase a third external 1TB HD and swap it out in my safe deposit box at my bank. Luckily, my bank is across the street, so swapping that will be no problem and take very little time. I don't plan to do this once a week...maybe once every 4-5 weeks. The odds of a hard drive crash are probably greater than my apartment burning down anyway.