What is the most operationally efficient way to take a one-time backup of an EBS volume that is attached to an EC2 instance?

Creating a snapshot of an EBS volume is the most operationally efficient method for a one-time backup. EBS snapshots are incremental backups, meaning only changed blocks are saved, making them quick and cost-effective. They are stored in Amazon S3 for durability and can be used to restore a new volume or create a new AMI. Attaching a second EBS volume and copying data is inefficient and requires manual intervention. Copying data to an external server via Direct Connect is complex, slower, and requires managing external infrastructure. Writing a custom script to copy data to S3 is also more complex, requires scripting knowledge, and might not capture the volume's consistent state as effectively as a snapshot.