Which RAID configuration is best for implementing disk redundancy with a MINIMUM number of disks?

RAID 1 is designed specifically for data redundancy, providing a mirrored setup that duplicates data across two disks. In this configuration, each piece of data is written identically to two drives, effectively creating a real-time backup. Because RAID 1 requires only a minimum of two disks, it is the most efficient choice for achieving redundancy with the smallest number of drives.

While RAID 5 and RAID 6 also offer redundancy, they require a minimum of three and four disks respectively. RAID 0 does not provide any redundancy at all, as it focuses solely on performance by striping data across multiple disks without duplication. Thus, for those seeking to implement disk redundancy with the least number of disks, RAID 1 stands out as the optimal solution.