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In a RAID 1 configuration, the key feature is that data is mirrored on two drives for redundancy. This means that every piece of data written to one drive is simultaneously written to a second drive. The primary advantage of this setup is that it provides a reliable safeguard against data loss; if one drive fails, the data remains accessible on the other drive. This mirroring ensures that users can continue to operate without disruption, making RAID 1 particularly valuable for systems requiring high availability and data integrity.

Other configurations mentioned, such as spreading data across multiple drives for performance or striping data for speed, pertain to different RAID levels like RAID 0 or RAID 5, which focus on performance rather than redundancy. Backing up data to an external server is also not a feature of RAID but rather a different approach to data protection. Thus, the emphasis on redundancy in RAID 1 is what distinctly characterizes this configuration.