Definition of RAID 1 drive
Raid 1 is an exact copy of a set of data on two or more disks, it optimizes the redundancy by creating image files for the source data, the image data and the source data are backup data to each other. And this lead to a big benefit: RAID can read the image data directly when the original data are busy, that is to say, RAID 1 has better reading performance than any other levels of RAID arrays. However, RAID 1 also has its weakness, it is the most expensive RAID array in unit costs and what’s more, since all the data are duplicated, twice of the storage space is necessary, that means RAID 1’s storage capacity requirements is the largest compared to other RAID arrays.
Why backup RAID 1 drive?
Although RAID 1 has a data protect function, backup RAID 1 drive is also important. Because the RAID 1’s work mode is to create images for original data not for the whole disk, and more than that, its major purpose is to enhance the reading speed, not to enhance the data security. Not only that, you also can backup RAID 1 drive to avoid system crash and data loss which may cause by software conflict, HDD overload, bad ram or hacker attacks. The best way to prevent these unwanted accidents is to install backup software.