deb-cinder/api-ref/source/v2/samples/backup-create-request.json

{
    "backup": {
        "container": null,
        "description": null,
        "name": "backup001",
        "volume_id": "64f5d2fb-d836-4063-b7e2-544d5c1ff607",
        "incremental": true
    }
}