# Query Backup Chain Range - DescribeUSnapBackupRange

## Overview

Query Backup Chain Range






## Definition

### Public Parameters

| Parameter Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Action**     | string  | Corresponding API command name, the current API is `DescribeUSnapBackupRange`.                      | **Yes** |
| **PublicKey**  | string  | The user's public key can be obtained from [Console](https://console.sigcalcloud.com/uaccount/api_manage)                                             | **Yes** |
| **Signature**  | string  | User signature generated based on public key and API command, see [Signature Algorithm](/docs/api/summary/signature.md)  | **Yes** |

### Request Parameters

| Parameter Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Region** | string | Region. See [List of Regions and Availability Zones](/docs/api/summary/regionlist) |**Yes**|
| **Zone** | string | Availability Zone. See [Availability Zone List](/docs/api/summary/regionlist) |**Yes**|
| **ProjectId** | string | Project ID. If not filled in, the default project is used, sub-accounts must be filled in. Please refer to the [GetProjectList interface](/docs/api/summary/get_project_list). |No|
| **VDiskId** | string | Disk ID |**Yes**|

### Response Field

| Field Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **RetCode** | int | Return status code. If it is 0, it means successful return. If it is not 0, it means failure. |**Yes**|
| **Action** | string | Operation command name. |**Yes**|
| **Message** | string | Returns an error message, providing detailed description when `RetCode` is non-zero. |No|
| **BackupRange** | [*BackupRange*](#backuprange) | Refer to the BackupRange model |**Yes**|
| **BackupMode** | string | Primer": Entry Version, "Base": Basic Version, "Enterprise": Enterprise Version, "Ultimate": Flagship Version, "Custom": Custom Backup Chain. |No|

#### Data Model


#### BackupRange

| Field Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Journal** | int | Second-level backup (per hour) |**Yes**|
| **Hour** | int | Hourly Backup (Unit: Hour) |**Yes**|
| **Day** | int | Sky-level Backup (Unit: Day) |**Yes**|

## Example

### Request Example
    
```
https://api.sigcalcloud.com/?Action=DescribeUSnapBackupRange
&Region=cn-zj
&Zone=cn-zj-01
&ProjectId=lPaVmxgH
&VDiskId=BWsRxFYA
```

### Response Example
    
```json
{
  "Action": "DescribeUSnapBackupRangeResponse",
  "BackupInfo": {},
  "BackupMode": "AFYWYTdu",
  "RetCode": 0
}
```