According to the AWS documentation on disaster recovery methods, Backup and Restore has the highest downtime among the listed options. The disaster recovery spectrum ranges from methods with the least downtime to those with the most downtime:

• Multi Site: Lowest downtime (active-active configuration)
• Warm Standby: Medium downtime (scaled-down environment ready for activation)
• Pilot Light: Higher downtime (core infrastructure ready but needs scaling)
• Backup and Restore: Highest downtime (requires full restoration from backups)

Backup and Restore involves restoring data from backups to new infrastructure, which takes the longest time compared to other methods where some infrastructure is already running or ready to be activated.