Hello,
We have a Veeam Backup O365 5.0.1.225 with a new backup job created two weeks ago, only for Mail and Archive. I think that the performance is too slow, the processing rate is 5.4MB/s, bottleneck: source, read rate 3.9MB/s and write rate 5.8MB/s. Is that normal? Our bandwidth to Internet is 280Mbps (35MB/s), download and upload,how can I troubleshooting this problem?
Thanks in advance,
Omar De Souza.
Best answer by Chris.Childerhose
Here is a discussion on Reddit about this - (2) VBO365 Slow Backup Speed : Veeam (reddit.com)
I would do two things -
+21According to this site you are not at the most current version - KB4106: Build numbers and versions of Veeam Backup for Microsoft Office 365
This won’t solve from what I can see in the release notes the speed issue that is throttling on the MS side of things during backups. You may want to look in to Security Groups where you can add multiple users for backing up things.
+21This explains how to do it and has a Powershell script to import the Accounts as well - Veeam Backup for Microsoft Office 365 Auxiliary Backup Automation
Also explains where at the bottom picture to manage backup accounts.
Thanks
+21Thanks
Yes the backup accounts also pertain to Mail & Archive as well because those get throttled by MS too. I have tested adding multiple accounts and it does help with backup speed but again this is dependent on many factors too as we know. 
+21Here is a discussion on Reddit about this - (2) VBO365 Slow Backup Speed : Veeam (reddit.com)
I would do two things -
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