---
title: "system.sfc.redundantCheckpoint"
description: "Synchronizes chart and step variables of the specified chart instance across a redundant cluster."
---

# system.sfc.redundantCheckpoint

> Synchronizes chart and step variables of the specified chart instance across a redundant cluster.

This function is used in **Python Scripting**.

## Description
Synchronizes chart and step variables of the specified chart instance across a redundant cluster, allowing the chart instance to continue where it left off if a redundant failover occurs. Check out [redundancy sync](ignition-modules\sequential-function-charts\SFC-basics\chart-properties.md#redundancy-sync) for more information.

## Client Permission Restrictions
[Permission Type](../../../ignition-modules/vision/vision-project-properties/vision-project-properties.md#vision-permissions-properties): SFC Management

Client access to this scripting function is blocked to users that do not meet the role/zone requirements for the above permission type. This function is unaffected when run in the Gateway scope.

## Syntax
`system.sfc.redundantCheckpoint(instanceId)`

### Parameters
Type | Parameter | Description 
------- | ------- | ------
String | `instanceId` | The instance identifier of the chart.

### Returns
Nothing
### Scope
Gateway, Vision Client, Perspective Session

## Code Examples

```python title="Code Snippet"
# This example will create a redundant checkpoint in case the primary Gateway in the redundant pair fails.
instanceId = "The ID of the chart you want to synchronize across the redundant pair"
 
system.sfc.redundantCheckpoint(instanceId)
```