The FinTech application at DataCore Inc. runs on EC2 instances within an Auto Scaling group behind an ALB, scaling dynamically with daily load variations, but the security team has identified missing log files in their central S3 bucket due to incomplete copying before instance termination, even with the log files copied every 15 minutes. What set of actions reliably ensures all log files are copied to the central S3 bucket from the terminated EC2 instances?