RAID 1 is a standard that aims to improve the security of stored data. The concept relies on a network of two or more hard disks to store data in a mirrored manner, i.e., in duplicate. This process is also known as ‘mirroring’. In a RAID 1 setup, files that are written and saved onto hard disk 1 are also written to hard disk 2 or other disks, which means that the system offers complete redundancy. If one data carrier fails, the next one jumps in.