What should a solutions architect do to migrate and store the data at the LOWEST cost?

Explanations:

AWS Snowball devices allow for efficient offline data transfer, making it ideal for transferring large amounts of data quickly. Using a lifecycle policy to transition to S3 Glacier Deep Archive ensures the data is stored at the lowest cost for long-term retention.

Deploying a VPN connection would not effectively handle the 700 TB of data transfer within the one-month timeframe, as it would be too slow and could incur higher costs for bandwidth usage. Additionally, S3 Glacier is not directly accessible via CLI for large-scale migrations efficiently.

While Direct Connect provides a more stable and potentially faster connection than a VPN, the setup process and costs associated with provisioning a Direct Connect line would be higher and could delay the migration, making it unsuitable for this scenario.

AWS DataSync is useful for transferring data, but it typically requires ongoing operational costs. Also, it may not complete the transfer within the desired timeframe for such a large dataset over the given bandwidth. Transitioning to S3 Glacier may not be as cost-effective as using Snowball for initial transfer.