Deploy an AWS Storage Gateway File Gateway to schedule daily backups of the Windows servers, storing the data in Amazon S3. In the event of a disaster, restore the on-premises servers from the backup, and for fallback, operate the servers on Amazon EC2 instances.

Develop AWS CloudFormation templates to establish infrastructure, using AWS DataSync to replicate data to Amazon Elastic File System (EFS). During a disaster, utilize AWS CodePipeline to deploy the templates for restoring on-premises servers, and for fallback, use DataSync to retrieve the data.

Set up an AWS CDK pipeline to create a multi-site active-active environment on AWS, replicating data to Amazon S3 via the s3 sync command. In case of a disaster, redirect DNS endpoints to AWS, and for fallback, employ the s3 sync command to restore data.

Employ AWS Elastic Disaster Recovery to replicate the on-premises servers, using AWS DataSync to copy data to an Amazon FSx for Windows File Server file system. Mount this file system to AWS servers. In the event of a disaster, failover the on-premises servers to AWS, and for fallback, use Elastic Disaster Recovery to revert to new or existing servers.