A company is performing a full migration of its systems from an on-premises data center to AWS. The company needs to move all the data stored on-premises to Amazon S3 within the next 4 weeks. Currently, the on-premises storage holds 900 TB of data and is connected to the Internet over a 100 Mbps link. Up to 20% of the link's throughput is regularly used in real time by existing systems. What is the MOST cost-effective way to perform the data migration in the given time frame?