If you want something to be used in compliance-related assessment you should use AWS Artifact. If your customer can download the SOC2 report and look at the Data Backup paragraph. You can clearly see 2 main statement:
Amazon S3 is designed to provide 99.999999999% durability and 99.99% availability of objects over a given year. Objects are redundantly stored on multiple devices across multiple facilities in an Amazon S3 region.
Amazon EBS replication is stored within the same availability zone, not across multiple zones, but customers can conduct regular snapshots to Amazon Simple Storage Service (S3) in order to provide long-term data durability.
EBS Snapshot - Retention complance & ExportAccepted Answerasked 5 years ago
EBS Snapshots Delayed, Not Starting for few minutes after API CallAccepted AnswerMODERATORasked 2 years ago
Total EBS Volume for an AWS Accountasked 5 years ago
InternalError creating EBS snapshotasked 5 months ago
Are the snapshot ids for EBS global throughout AWS?asked 3 months ago
EBS snapshots and S3 encryptionasked 3 years ago
EBS snapshot resilience to AZ failuresAccepted Answerasked 2 years ago
Snapshots of encrypted EBS volumesasked 3 months ago
How do I report a bug present with EBS snapshot feature in "AWS console"?asked 6 months ago
Snapshot of EBS volume created from snapshotasked 4 years ago