Answer: Use AWS Snowball.

## Explanation **Why AWS Snowball is the correct answer:** 1. **Data Volume and Time Constraints:** - 20 TB = 20,000 GB = 20,000,000 MB - Network bandwidth: 15 Mbps = 1.875 MB/s (15 ÷ 8) - Maximum utilization: 70% = 1.3125 MB/s 2. **Time Calculation:** - At maximum throughput: 20,000,000 MB ÷ 1.3125 MB/s = 15,238,095 seconds - This equals approximately **176 days** (15,238,095 ÷ 86,400 seconds/day) - The requirement is **30 days**, which is impossible with the given network constraints 3. **AWS Snowball Solution:** - AWS Snowball is a physical data transport solution that uses secure appliances to transfer large amounts of data - You can order a Snowball device, load your data onto it, and ship it back to AWS - This bypasses network limitations entirely - Each Snowball device can handle up to 80 TB of data - The transfer happens offline, so network bandwidth is not a constraint **Why other options are incorrect:** **B. AWS DataSync:** - Designed for ongoing data synchronization over the network - Still uses network bandwidth, so it would take ~176 days - Not suitable for one-time migration with tight deadlines and bandwidth constraints **C. Secure VPN connection:** - Would use the same limited network bandwidth - Would take ~176 days to complete - Doesn't address the fundamental bandwidth limitation **D. Amazon S3 Transfer Acceleration:** - Uses Amazon CloudFront's globally distributed edge locations - Optimizes for faster uploads but still uses network bandwidth - Maximum improvement is limited by the source's upload capacity - Would still take far longer than 30 days **Key Takeaway:** When migrating large datasets with limited bandwidth and tight deadlines, AWS Snowball (or Snowmobile for petabyte-scale data) is the appropriate solution for offline data transfer.

Author: LeetQuiz Editorial Team