Putting your data in only one place is *never* the right way if it's at all important to you. Your data goes in one place so you can work on it. It goes in another place so the hardware can fail (redundancy to protect against a dead HD). It goes in a third place so the people can fail (Oops! I deleted a file three weeks ago and just noticed!). It goes in a fourth place so reality can fail (lightning, flood, etc.). And if you're paranoid, it goes in a fifth place in case something unforseen happens.