What is cold hdd?

Cold HDD (sc1) volumes provide low-cost magnetic storage that defines performance in terms of throughput rather than IOPS; basically sc1 volumes are a good fit for large, infrequent
and sequential cold-data workloads.

What is incremental snapshot?

An incremental backup, meaning we only store the blocks on the volume that have been altered since the latest snapshot.

Which type of Amazon EBS volume provides highest IOPS performance.

EBS Provisioned IOPS (io2) SSD has highest IOPS performance.

What is S3?

Which type of Amazon EBS volume provides highest IOPS performance.