---
title: "How to Mirror Slack Retention Policies in Onna"
slug: "how-to-mirror-slack-retention-policies-in-onna"
tags: ["How to ", "mirror", "Slack Retention"]
updated: 2025-01-13T20:35:10Z
published: 2025-04-29T12:20:57Z
canonical: "docs.revealdata.com/how-to-mirror-slack-retention-policies-in-onna"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.revealdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Mirror Slack Retention Policies in Onna

![](https://cdn.us.document360.io/3e21d801-ca9f-4c51-93db-9cbd32741f3d/Images/Documentation/how-to-mirror-slack-retention-policies-in-onna-image-hhr2o3y4.png)

#### **In this article you will learn**:

- How to Enable Mirroring Slack Retention

## **How to Enable Mirroring Slack Retention**

Onna offers a mirror sync for Slack Enterprise that will mirror any retention policy set within your organization's Slack account. If you choose to enable mirror sync, any messages that are removed from Slack due to a retention policy would then be removed from Onna as well, unless that information is under legal hold.

Once enabled, Onna will ensure that all existing Slack Enterprise sources currently on 'Auto-sync and archive' in Onna comply with the retention policies found within Slack. Any messages and attachments that are no longer retained in Slack will not be retained in Onna within 24 hours of their dropping out of Slack.

It is important to know that, in Onna, if the user is an owner of an archive source, and that user is locked, Onna will no longer mirror Slack retention policies for the source. This is due to the locked user no longer being able to delete resources from Onna. New resources will continue to sync into Onna as long the authorization is still valid. This setting will not apply to Slack Enterprise sources that are on one-time sync.

> [!NOTE]
> Note:
> 
> This feature can only be accessed by admins and is set to affect all Slack Enterprise sources across your Onna environment. Onna will mirror the setting that it finds within Slack Enterprise and will obey it at whatever level is found. Multiple retention settings in Slack Enterprise (i.e. separate policies for Channels vs Direct Messages) can coexist in the same source or across different sources in Onna. If you have Slack Enterprise sources that are running as legal holds, please make sure they are also on source hold in Onna.Your content goes here

To enable mirroring of Slack retention policies in Onna, follow the steps below:

1. Click **Admin preferences** and select **Sources**.

![](https://cdn.us.document360.io/3e21d801-ca9f-4c51-93db-9cbd32741f3d/Images/Documentation/image-6TYK7UC8.png)
2. Click the arrow next to **Source configuration** to expand that section.

![](https://cdn.us.document360.io/3e21d801-ca9f-4c51-93db-9cbd32741f3d/Images/Documentation/image-WC12WU5L.png)
3. **Check** the box next to **Mirror Slack Enterprise retention settings.**

![](https://cdn.us.document360.io/3e21d801-ca9f-4c51-93db-9cbd32741f3d/Images/Documentation/image-9EFAZ973.png)

Once you check the box, Onna will begin applying Slack retention policies to handle your data within Onna, except when that data is under hold.