---
title: "Start-VBORepositorySynchronizeSession"
description: "This cmdlet creates and starts a session to synchronize cache between object storage repositories and the PersistentCache database on the PostgreSQL instance."
canonical: "https://helpcenter.veeam.com/docs/vbo365/powershell/start-vborepositorysynchronizesession.html"
breadcrumb: "PowerShell Reference > Veeam Backup for Microsoft 365 PowerShell Reference > Backup Infrastructure > JET-based Backup Repositories and Object Storage Repositories > Start-VBORepositorySynchronizeSession"
dateModified: "2026-08-21"
---

# Start-VBORepositorySynchronizeSession

## Short Description
Creates and starts a session to synchronize cache between object storage repositories and the *PersistentCache* database on the PostgreSQL instance.

## Syntax
```
Start-VBORepositorySynchronizeSession -Repository <VBORepository> [<CommonParameters>]
```

## Detailed Description
This cmdlet creates and starts a session to synchronize cache between object storage repositories and the *PersistentCache* database on the PostgreSQL instance.

For more information on cache synchronization, see the [Synchronizing Cache](https://helpcenter.veeam.com/docs/vbo365/guide/synch_repositories.html?ver=8) section of the Veeam Backup for Microsoft 365 User Guide.

## Parameters

<table style="width:100%;" class="Blue_Table">
      <tr style="vertical-align:top">
        <th style="width:20%;">
          <p>Parameter</p>
        </th>
        <th style="width:20%;">
          <p>Description</p>
        </th>
        <th style="width:20%;">
          <p>Type</p>
        </th>
        <th style="width:10%;">
          <p>Required</p>
        </th>
        <th style="width:10%;">
          <p>Position</p>
        </th>
        <th style="width:10%;">
          <p>Accept Pipeline Input</p>
        </th>
      </tr>
      <tr style="vertical-align:top">
        <td>
          <p class="Table_Text_Bold"><span class="Table_Text_Bold">Repository</span></p>
        </td>
        <td>
          <p>Specifies an object storage repository. The cmdlet will synchronize cache between this object storage repository and the <em>PersistentCache</em> database on the PostgreSQL instance.</p><p>Accepts the <a href="vborepository.md"><code>VBORepository</code></a> object.</p><p>To get this object, run the <a href="get-vborepository.md"><code>Get-VBORepository</code></a> cmdlet.</p>
        </td>
        <td style="width:10%;">
          <p><a href="vborepository.md"><code>VBORepository</code></a></p>
        </td>
        <td style="width:10%;">
          <p>True</p>
        </td>
        <td style="width:10%;">
          <p>Named</p>
        </td>
        <td style="width:10%;">
          <p>False</p>
        </td>
      </tr>
    </table>

`<CommonParameters>`

This cmdlet supports Microsoft PowerShell common parameters. For more information on common parameters, see the [About Common Parameters](http://go.microsoft.com/fwlink/p/?LinkID=113216) section of Microsoft Learn.

## Output Object
The cmdlet returns the [`VBORepositorySynchronizeSession`](vborepositorysynchronizesession.md) object that contains details on the synchronization status of an object storage repository.

## Examples

::: example
### Example 1: Synchronizing Microsoft Azure Blob Storage Cache

This example shows how to start synchronizing Microsoft Azure Blob Storage cache with the *PersistentCache* database on the PostgreSQL instance.

```
$azurestorage = Get-VBORepository -Name "Azure"
Start-VBORepositorySynchronizeSession -Repository $azurestorage
RepositoryId                            RepositoryName                          Status
------------                            --------------                          ------
1e74b71a-def4-41c6-8826-5d6fc8ad7c0f    Azure                                   Synchronizing... (35%)
```

Perform the following steps:

1. Run the [`Get-VBORepository`](get-vborepository.md) cmdlet. Specify the `Name` parameter value. Save the result to the `$azurestorage` variable.
2. Run the `Start-VBORepositorySynchronizeSession` cmdlet. Set the `$azurestorage` variable as the `Repository` parameter value.

   The cmdlet output will contain the following details on synchronization status of an object storage repository: `RepositoryId`, `RepositoryName` and `Status`.

:::

::: example
### Example 2: Synchronizing Amazon S3 Object Storage

This example shows how to start synchronizing Amazon S3 object storage repository cache with the *PersistentCache* database on the PostgreSQL instance.

```
$amazonstorage = Get-VBORepository -Name "Amazon S3"
Start-VBORepositorySynchronizeSession -Repository $amazonstorage
RepositoryId                            RepositoryName                          Status
------------                            --------------                          ------
d745ba88-719d-4bc6-883a-5559e001ac62    Amazon S3                               Synchronizing... (68%)
```

Perform the following steps:

1. Run the [`Get-VBORepository`](get-vborepository.md) cmdlet. Specify the `Name` parameter value. Save the result to the `$amazonstorage` variable.
2. Run the `Start-VBORepositorySynchronizeSession` cmdlet. Set the `$amazonstorage` variable as the `Repository` parameter value.

   The cmdlet output will contain the following details on synchronization status of an object storage repository: `RepositoryId`, `RepositoryName` and `Status`.

:::

::: example
### Example 3: Synchronizing S3 Compatible Object Storage

This example shows how to start synchronizing S3 Compatible object storage repository cache with the *PersistentCache* database on the PostgreSQL instance.

```
$s3compatible = Get-VBORepository -Name "S3 Compatible object storage"
Start-VBORepositorySynchronizeSession -Repository $s3compatible
RepositoryId                            RepositoryName                          Status
------------                            --------------                          ------
af061087-7b8b-4c76-84b7-8a2858b15ae6    S3 Compatible object storage            Synchronizing... (51%)
```

Perform the following steps:

1. Run the [`Get-VBORepository`](get-vborepository.md) cmdlet. Specify the `Name` parameter value. Save the result to the `$s3compatible` variable.
2. Run the `Start-VBORepositorySynchronizeSession` cmdlet. Set the `$s3compatible` variable as the `Repository` parameter value.

   The cmdlet output will contain the following details on synchronization status of an object storage repository: `RepositoryId`, `RepositoryName` and `Status`.

:::

## Related Commands

[`Get-VBORepository`](get-vborepository.md)