Explanation

Warm standby has the lowest downtime among the listed disaster recovery deployment mechanisms.

Disaster Recovery Spectrum:

• Backup Restore: Highest downtime - involves restoring from backups after a disaster occurs
• Pilot Light: Moderate downtime - core infrastructure is running but needs scaling up
• Warm Standby: Lowest downtime - minimal infrastructure is always running and ready to scale
• DevOps: Not a disaster recovery mechanism - refers to development operations practices

Key Points:

• Warm standby maintains a scaled-down version of the environment that can be quickly scaled up during a disaster
• This approach provides faster recovery times compared to pilot light or backup restore methods
• The AWS documentation shows that warm standby is at the end of the spectrum with the least downtime for users

For more information on AWS disaster recovery techniques, refer to: https://aws.amazon.com/blogs/aws/new-whitepaper-use-aws-for-disaster-recovery/