Can I download unattached EBS volume to my local computer?

Yes, it is possible to download an unattached Amazon EBS volume to your local computer, but it requires a multi-step process involving creating a snapshot of the EBS volume and then copying that snapshot to your local system.

Create a Snapshot: First, create a snapshot of the unattached EBS volume using the AWS Management Console, AWS CLI, or AWS SDKs. Snapshots are point-in-time backups of EBS volumes and serve as the basis for creating new volumes. Export Snapshot to S3: Once the snapshot is created, you can export it to Amazon S3 using the AWS CLI or SDKs. This step makes the snapshot data available for download from S3. Download Snapshot from S3: After exporting the snapshot to S3, you can download the snapshot file(s) to your local computer using tools like the AWS CLI, AWS SDKs, or third-party S3 client applications. Restore Snapshot Locally: Once the snapshot is downloaded to your local system, you can use tools like the AWS CLI or third-party utilities to restore the snapshot to a local disk or mount it as a volume on your local Linux system.

Hope it clarifies and if does I would appreciate answer to be accepted so that community can benefit for clarity, thanks ;)

If you are looking for data in your unattached volume, you can follow this link. With EBS you cannot export volume snapshots to your S3 bucket.