Option A is the correct strategy. Enabling EC2 instance backups and storing them in Amazon S3 ensures that you have a copy of your instance data that can be used for recovery in case of failures. This approach provides a reliable and cost-effective disaster recovery solution. Option B is useful for scaling but does not address the backup and recovery requirements. Option C is important for maintaining IP address continuity but does not provide data recovery. Option D can be used for automation but does not address the backup and recovery requirements.