Final answer:
Amazon EBS snapshots are stored on Amazon S3, enabling high durability and efficient storage through incremental backups.
Step-by-step explanation:
Amazon EBS snapshots are stored on Amazon S3. They are not stored on the EBS instance store, within the EBS block store, or on an Amazon EFS filesystem.
Snapshots are backups of your EBS volumes that are incrementally saved so that only the blocks on the device that have changed after your most recent snapshot are saved to S3.
This conserves both space and cost.
When a snapshot is triggered, it is stored asynchronously in the background, allowing you to continue using your EBS volume. The storage of snapshots on S3 ensures high durability and availability.