Maintain control of your Microsoft Office 365 email data
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Full Name: Florent THIESSET

Slow backup office 365

Post by flo7abb » Dec 16, 2016 4:00 pm


Today, I have tested backup via veeam backup office365.
I have a problem with backup time, 8 Go in 1h45. (fiber)
My customers has 1,4 To saved. The time required would be 8-10 days.
Limitation of Office 365 ? A solution for the first backup ?



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Full Name: Alexander Fogelson

Re: Slow backup office 365

Post by foggy » Dec 19, 2016 11:23 am

Hello Florent, too little information to judge, I'd appreciate if you open a case with our technical support and provide logs and some additional info for investigation.

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Full Name: David

Re: Slow backup office 365

Post by david.buchanan » Jan 12, 2017 8:33 am

One of the main reasons for anything being slow out of Office365 is because people use DNS servers that return Office365 clusters that are not the closest to them.

For example, if you query Google's for it will normally return with an average ping of 110-120ms.

However, if you query any AU based DNS server (Internode or Telstra for example) it returns with an average ping of 2-4ms.

The speed difference between these two Office365 sites is also huge. I get 500KB/s-1MB/s via outlook-apacsouth vs 8-10MB/s vis outlook-au.

This suggestion is a complete guess because as Foggy says theres not much info to go on but this might save you a lot of time if it's the cause as it was for me.


Mike Resseler
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Full Name: Mike Resseler
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Re: Slow backup office 365

Post by Mike Resseler » Jan 12, 2017 12:29 pm


This is indeed one of the reasons. Theoretically, when you query O365 you would get the closest one to your area. Your request would go over the internal Azure network and still be very decent in speed. Their internal network is impressive.

However, some companies might query it from APAC but the proxy or router or whatever is located somewhere else which already causes the delay.

Last but not least, O365 has made throttling limitations which can only be lifted by contacting MSFT support. It is also described in our documentation

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