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Copy file name to clipboardExpand all lines: articles/backup/offline-backup-azure-data-box.md
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---
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title: Offline backup by using Azure Data Box
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description: Learn how you can use Azure Data Box to seed large initial backup data offline from the MARS Agent to a Recovery Services vault.
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ms.topic: conceptual
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ms.date: 1/27/2020
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ms.topic: how-to
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ms.date: 1/23/2023
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author: jyothisuri
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ms.author: jsuri
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ms.service: backup
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ms.custom: engagement-fy23
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---
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# Azure Backup offline backup by using Azure Data Box
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This article describes how you can use Azure Data Box to seed large initial backup data offline from the MARS Agent to a Recovery Services vault.
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You can use [Azure Data Box](../databox/data-box-overview.md) to seed your large initial Microsoft Azure Recovery Services (MARS) backups offline (without using network) to a Recovery Services vault. This process saves time and network bandwidth that would otherwise be consumed moving large amounts of backup data online over a high-latency network. Offline backup based on Azure Data Box provides two distinct advantages over [offline backup based on the Azure Import/Export service](./backup-azure-backup-import-export.md):
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- There's no need to procure your own Azure-compatible disks and connectors. Azure Data Box ships the disks associated with the selected [Data Box SKU](https://azure.microsoft.com/services/databox/data/).
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- Azure Backup (MARS Agent) can directly write backup data onto the supported SKUs of Azure Data Box. This capability eliminates the need for you to provision a staging location for your initial backup data. You also don't need utilities to format and copy that data onto the disks.
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## Azure Data Box with the MARS Agent
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## Support matrix
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This article explains how you can use Azure Data Box to seed large initial backup data offline from the MARS Agent to a Recovery Services vault.
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This section explains the supported scenarios.
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## Supported platforms
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###Supported platforms
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The process to seed data from the MARS Agent by using Azure Data Box is supported on the following Windows SKUs.
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| Windows Server 2008 R2 SP1 64 bit | Standard, Enterprise, Datacenter, Foundation |
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| Windows Server 2008 SP2 64 bit | Standard, Enterprise, Datacenter |
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## Backup data size and supported Data Box SKUs
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###Backup data size and supported Data Box SKUs
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| Backup data size (post-compression by MARS)* per server | Supported Azure Data Box SKU |
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> [!IMPORTANT]
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> Don't select *BlobStorage* for the **Account kind**. The MARS Agent requires an account that supports page blobs, which isn't supported when *BlobStorage* is selected. Select **Storage V2 (general purpose v2)** as the **Account kind** when you create the target storage account for your Azure Data Box job.
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## Install and set up the MARS Agent
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1. Open the **Microsoft Azure Backup** application on your server.
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1. On the **Actions** pane, select **Schedule Backup**.
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1. Follow the steps in the **Schedule Backup Wizard**.
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1. Add items by selecting the **Add Items** button. Keep the total size of the items within the [size limits supported by the Azure Data Box SKU](#backup-data-size-and-supported-data-box-skus) that you ordered and received.
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1. Select the appropriate backup schedule and retention policy for **Files and Folders** and **System State**. System state is applicable only for Windows Servers and not for Windows clients.
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1. On the **Choose Initial Backup Type (Files and Folders)** page of the wizard, select the option **Transfer using Microsoft Azure Data Box disks** and select **Next**.
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1. Sign in to Azure when prompted by using the user credentials that have Owner access on the Azure subscription. After you succeed in doing so, you should see a page that resembles this one.
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The MARS Agent then fetches the Data Box jobs in the subscription that are in the Delivered state.
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1. Select the correct Data Box order for which you've unpacked, connected, and unlocked your Data Box disk. Select **Next**.
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1. Select **Detect Device** on the **Data Box Device Detection** page. This action makes the MARS Agent scan for locally attached Azure Data Box disks and detect them.
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If you connected the Azure Data Box instance as a network share (because of unavailability of USB ports or because you ordered and mounted the 100-TB Data Box device), detection fails at first. You're given the option to enter the network path to the Data Box device.
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>[!IMPORTANT]
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> Provide the network path to the root directory of the Azure Data Box disk. This directory must contain a directory by the name *PageBlob*.
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>For example, if the path of the disk is `\\mydomain\myserver\disk1\` and *disk1* contains a directory called *PageBlob*, the path you enter on the MARS Agent wizard page is `\\mydomain\myserver\disk1\`.
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The following page confirms that the policy is saved successfully.
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1. Select **Close** on the previous page.
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1. Select **Back Up Now** in the **Actions** pane of the MARS Agent console. Select **Back Up** on the wizard page.
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The MARS Agent starts backing up the data you selected to the Azure Data Box device. This process might take from several hours to a few days. The amount of time depends on the number of files and connection speed between the server with the MARS Agent and the Azure Data Box disk.
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After the backup of the data is finished, you'll see a page on the MARS Agent that resembles this one.
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## Post-backup steps
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Check to see if the following error message appears in the MAB console when you configured offline backup.
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#### Step 2 of verification
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3. Go to the Azure offline backup application mentioned in step 2. Select **Settings** > **Keys** > **Upload Public Key**. Upload the certificate you exported in the previous step.
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4. In the server, open the registry by entering **regedit** in the run window.
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7. To get the value of the thumbprint, double-click the certificate. Select the **Details** tab, and scroll down until you see the thumbprint field. Select **Thumbprint**, and copy the value.
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