AWS Snowmobile is designed for exabyte-scale offline data transfer and is the fastest option for moving very large datasets, such as 25 PB, from locations with limited network bandwidth. It avoids WAN constraints by physically transporting data in a secure, truck-based appliance directly into AWS. The option AWS Snowball is intended for terabytes to a few petabytes and would require many devices and multiple jobs, extending overall timelines for 25 PB. The option AWS Direct Connect relies on network throughput. Even at 10 Gbps, 25 PB would take roughly 231 days, and provisioning high-capacity links can add time. The option Amazon S3 Transfer Acceleration improves internet transfers via edge locations but remains limited by the site’s outbound bandwidth and is not optimal for tens of petabytes when time is critical. For data volumes of 10 PB or more or when the site has constrained bandwidth, think offline ingestion with Snowmobile. For up to a few petabytes with limited or no reliable network, consider Snowball. For ongoing network transfers where bandwidth is sufficient, services like DataSync, Direct Connect, or S3 Transfer Acceleration can fit. Quickly estimate feasibility by dividing total data by effective throughput (e.g., 25 PB at 10 Gbps is about 231 days), then decide whether offline is required.