How to delete an orphaned Snapshot from deleted Backup Vault?

Check if you can list the snapshots in AWS Backup Protected Resources tab by below CLI. aws backup list-protected-resources aws backup list-recovery-points-by-resource --resource-arn "ARN"

If you can see them, you can use delete command that would list and also delete all the recovery points for that Volume resource, following is the example command: aws backup list-recovery-points-by-resource --resource-arn <Resource ARN> --region <Region> --output json --query 'RecoveryPoints[].[BackupVaultName,RecoveryPointArn]' | jq -r '.[] | "--backup-vault-name '''" + .[0] + "''' --recovery-point-arn " + .[1]' | xargs -L1 aws backup delete-recovery-point --region <Region>