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Question

How to Back Up Office 365 to an On-Premises Location

  • November 25, 2025
  • 5 replies
  • 83 views
D
Byte
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Hi all,

Could you please advise me on how to back up Microsoft Office 365 (Exchange Online or SharePoint Online) specifically to an on-premise location?

I would like to verify if my understanding of the architecture is correct:
 

Access Node: Is it correct that I need to install an Access Node (proxy) within the customer's on-premise infrastructure? I assume this node handles the communication with the Microsoft Cloud and downloads the data.

Storage Target: Is the local disk library selected as the destination storage when I Create a Microsoft 365 Plan?
 

I am currently looking at this documentation link: https://documentation.commvault.com/2023e/software/getting_started_with_exchange_online.html#procedure

Procedure:

  1. Verify that your environment meets the system requirements for Exchange Online.

  2. Add access nodes.

  3. Complete the Microsoft 365 service catalog.

  4. Create a Microsoft 365 plan.

  5. Add the mailboxes that you want to back up.

  6. Perform a test backup and restore.

Is this the correct procedure to follow for an on-premise backup target, or are there specific steps I am missing?

I would be very grateful for your help and inputs!

5 replies

G
Vaulter
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  • GseibakVaulter
  • Vaulter
  • November 25, 2025

@drphil - yes that’s right access node will pull the data from sharepoint and/or onedrive. 

The plan will define where you want to send the data during the backup.

Gary Seibak - TAM Commvault
D
Jennifer Kelley
D
Byte
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  • drPhil
  • Author
  • Byte
  • November 26, 2025

Hi ​@Gseibak  thanks a lot for your input and for clarifying the procedure for o365 to on-prem backup.

Just a quick question - do you have any experience with configuring the o365 backup to on-premise location? I'm just looking for some real-world feedback. Are there any major headaches or pitfalls I should watch out for? I'm a bit skeptical that it's going to be a smooth ride, so any tips are welcome!

Jennifer Kelley
Vaulter
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Hi ​@drPhil there’s some good best practice insights in this older post on the topic, particularly from ​@Jos Meijer. (Ignore some of the software version references as they are a bit out of date of course.) 

 

Jos Meijer
D
G
Vaulter
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  • GseibakVaulter
  • Vaulter
  • November 26, 2025

hi ​@drPhil  - yes , I have a customer doing just that. it’s on prem config but they are using a cloud library as the storage target. Do you know what version of CV you are going to use for this effort. Ideally 11.40 would be the preference. I have a customer on 11.36 using it but there are some fixes / enhancements in 11.40.

it went pretty smooth - you will still need to do some work in your azure portal regarding certs and permissions. 

SP perms - https://documentation.commvault.com/2024e/software/request_and_grant_permissions_to_azure_apis_for_azure_app_for_sharepoint_online.html

 

one-drive perms - Port Requirements for OneDrive for Business

Gary Seibak - TAM Commvault
D
Jennifer Kelley
D
Byte
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  • drPhil
  • Author
  • Byte
  • November 27, 2025

Hi ​@Gseibak  and ​@Jennifer Kelley - big thanks for your contribution to this topic. 😀

Indeed, the CV version is 11.32, which is quite older one... I would say, it is very difficult to estimate the time needed for the configuration and implementation, especially for someone who doesn't have experience with this task. However, it is always good to hear that such an implementation is working properly and as intended for others.

Jennifer Kelley
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