A:Answer Hi OldGreg, Please be informed that My Cloud EX2 Ultra is to provide improved performance within 24x7 environments. Moreover, My Cloud EX2 Ultra NAS features a variety of RAID settings, so you can customize your system with the configuration that’s best for you. Yes, it possible, if you want to take backup on a new pair of drives each time. Changing only one drive can lead to data loss. We always recommend to take data backup from the drives before making any changes to the device. Therefore, please refer to this public link (https://www.carbonite.com/blog/article/2016/01/what-is-3-2-1-backup) from carbonite for your reference to implement the 3-2-1 backup strategy. -Need Help? Please see our "'Contact Us" page for information.