Once upon a time we had a Mac. Or two. We backed them up with an external drive and Time Machine. Then we had an iPhone. We backed it up and updated it with iTunes on our Mac. The digital hub. Simple. However, over the years, our devices and data have proliferated as Apple has expanded its products and services. Today, we’re in flux. There are few warm fuzzies. We’re not yet where we hope and need to be.
Guess what? RAID support is back in Disk Utility in macOS Sierra. You won’t find it in the main interface (see below), but you will find it in the File Menu.