-
- Service Provider
- Posts: 157
- Liked: 23 times
- Joined: May 21, 2014 8:47 am
- Location: New Zealand
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Case #07219006
I'm in the same boat as some above where issue started around 27/3 and is still persisting.
Some clients that normally do 20GB incrementals are doing 100-500GB per day
I have also logged a case with MS as per Veeam tech instructions.
If this isn't resolved soon it is really going to dig into our ability to provide a cost effective solution to our clients.
I'm in the same boat as some above where issue started around 27/3 and is still persisting.
Some clients that normally do 20GB incrementals are doing 100-500GB per day
I have also logged a case with MS as per Veeam tech instructions.
If this isn't resolved soon it is really going to dig into our ability to provide a cost effective solution to our clients.
-
- Veeam ProPartner
- Posts: 576
- Liked: 108 times
- Joined: Dec 29, 2009 12:48 pm
- Full Name: Marco Novelli
- Location: Asti - Italy
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
I'm wondering if also other M365 Backup Vendors are in the same boat, like Acronis , Keepit, CodeTwo... Maybe Veeam could contact them to share this issue and do some brainstorming with / against Microsoft
Marco
Marco
-
- Chief Product Officer
- Posts: 31969
- Liked: 7439 times
- Joined: Jan 01, 2006 1:01 am
- Location: Baar, Switzerland
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Yes, other backup vendors are affected as well. Our partner team at Microsoft works with other backup vendors too, this is how we know it's not just us.
Of course, it's more "publicly visible" in case of Veeam simply because we protect more M365 mailboxes than most other vendors combined.
Of course, it's more "publicly visible" in case of Veeam simply because we protect more M365 mailboxes than most other vendors combined.
-
- Veeam ProPartner
- Posts: 576
- Liked: 108 times
- Joined: Dec 29, 2009 12:48 pm
- Full Name: Marco Novelli
- Location: Asti - Italy
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Well done Gostev
Now I'm wondering how a Product Manager at Microsoft can give "green light" to a backend update that impact in such a HUGE way the backup ecosystem...
By the way Gostev, do you know what technology there is behind the Microsoft 365 Backup that started to appear in some Microsoft 365 tenants? https://learn.microsoft.com/en-us/micro ... -worldwide
Marco

Now I'm wondering how a Product Manager at Microsoft can give "green light" to a backend update that impact in such a HUGE way the backup ecosystem...

By the way Gostev, do you know what technology there is behind the Microsoft 365 Backup that started to appear in some Microsoft 365 tenants? https://learn.microsoft.com/en-us/micro ... -worldwide
Marco
-
- Chief Product Officer
- Posts: 31969
- Liked: 7439 times
- Joined: Jan 01, 2006 1:01 am
- Location: Baar, Switzerland
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Yes, in simple terms this will allow "entire mailbox snapshots". We will integrate with this tech once released b/c it is complementary in the same way as storage-based snapshots are complementary to proper backups for VMware protection.
-
- Influencer
- Posts: 12
- Liked: 1 time
- Joined: Oct 24, 2023 2:06 pm
- Full Name: Nikola Nikolic
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Hi,
Is there any update regarding this topic?
Backup increased now from 300GB to 1.2TB.
Is there any update regarding this topic?
Backup increased now from 300GB to 1.2TB.
-
- Chief Product Officer
- Posts: 31969
- Liked: 7439 times
- Joined: Jan 01, 2006 1:01 am
- Location: Baar, Switzerland
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Microsoft is on it. They are also working to provide a statement we can share publicly, but as all such statements it needs to gather many approvals first.
We already have an excellent explanation from them about what happened and how they plan to minimize similar changes in future, but these details are provided under NDA and we're not allowed to share them publicly.
We already have an excellent explanation from them about what happened and how they plan to minimize similar changes in future, but these details are provided under NDA and we're not allowed to share them publicly.
-
- Chief Product Officer
- Posts: 31969
- Liked: 7439 times
- Joined: Jan 01, 2006 1:01 am
- Location: Baar, Switzerland
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Microsoft provided us with the following statement that we're allowed to share with our customers:
Due to changes we are making to optimize search and compatibility functionality within our service, this action led to re-indexing for some of our customers' data.
The re-indexing is not indicative of a change to fields material to our BCDR and storage partners, so we will be working on a change to minimize the re-indexing that is prompting another backup of customer data.
We made changes over the weekend that should pause the unexpected behavior and those changes will be in place until Microsoft and our partners are able to make longer term enhancements to avoid future issues from taking place.
Thank you for your patience.
Due to changes we are making to optimize search and compatibility functionality within our service, this action led to re-indexing for some of our customers' data.
The re-indexing is not indicative of a change to fields material to our BCDR and storage partners, so we will be working on a change to minimize the re-indexing that is prompting another backup of customer data.
We made changes over the weekend that should pause the unexpected behavior and those changes will be in place until Microsoft and our partners are able to make longer term enhancements to avoid future issues from taking place.
Thank you for your patience.
-
- Veeam ProPartner
- Posts: 576
- Liked: 108 times
- Joined: Dec 29, 2009 12:48 pm
- Full Name: Marco Novelli
- Location: Asti - Italy
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
"some" data
I think they re-indexed the same data over and over again...
Marco

I think they re-indexed the same data over and over again...

Marco
-
- Enthusiast
- Posts: 31
- Liked: 5 times
- Joined: Oct 28, 2020 1:14 pm
- Full Name: Lars Freiberger
- Location: Germany
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
yep, "some"...

it sure seems like some mailboxes have been re-indexed over and over again. for some of our mailboxes, three or four times the total mailbox size has been backed up over the past weeks. but looking at the past 3 days, backup sizes seem to be back to levels we've been used to before the issue started.
glad this is fixed and fingers crossed this issue will not resurface again.
-
- Influencer
- Posts: 21
- Liked: 6 times
- Joined: Oct 16, 2019 7:43 pm
- Full Name: David Torreggiani
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
I am still seeing huge incrementals
-
- Veeam Software
- Posts: 3293
- Liked: 794 times
- Joined: Oct 21, 2011 11:22 am
- Full Name: Polina Vasileva
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Hi David,
Do you have a case with our support? Also, in which region/data center are you seeing the issue?
Do you have a case with our support? Also, in which region/data center are you seeing the issue?
-
- Influencer
- Posts: 21
- Liked: 6 times
- Joined: Oct 16, 2019 7:43 pm
- Full Name: David Torreggiani
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
I have a case going with MS.
Their reply as of this morning:
Will post here further updates.
Thanks for checking Polina
PS: region: Americas/US
Their reply as of this morning:
Am I the only one still dealing with this?I’m continuing to work with the product team on this. I don’t yet have an update unfortunately. This might take a little bit of time as there are multiple tenants impacted as you’ve noted. I apologize for this continued inconvenience here.
Will post here further updates.
Thanks for checking Polina
PS: region: Americas/US
-
- Enthusiast
- Posts: 31
- Liked: 5 times
- Joined: Oct 28, 2020 1:14 pm
- Full Name: Lars Freiberger
- Location: Germany
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
since monday i have noticed another increase in the amount of data in our exchange backups. it seems to me as if once again, data that has already been backed up in the past is being backed up again. has anyone else noticed this?
-
- Service Provider
- Posts: 97
- Liked: 34 times
- Joined: Oct 31, 2021 7:03 am
- Full Name: maarten
- Contact:
-
- Veeam Software
- Posts: 3293
- Liked: 794 times
- Joined: Oct 21, 2011 11:22 am
- Full Name: Polina Vasileva
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
@VNR-LF and @MaartenA
Please open cases with Veeam support (if you haven't done that yet) and provide me with your case IDs.
We were recently notified of a similar issue by another customer, and now the more data we have to provide to Microsoft, the better.
Thanks!
Please open cases with Veeam support (if you haven't done that yet) and provide me with your case IDs.
We were recently notified of a similar issue by another customer, and now the more data we have to provide to Microsoft, the better.
Thanks!
-
- Service Provider
- Posts: 97
- Liked: 34 times
- Joined: Oct 31, 2021 7:03 am
- Full Name: maarten
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
@Polina. See Case #07398831
-
- Veteran
- Posts: 395
- Liked: 56 times
- Joined: Sep 05, 2011 1:31 pm
- Full Name: Andre
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
see a similiar increase as well..
Case id: #07400232
Case id: #07400232
-
- Enthusiast
- Posts: 31
- Liked: 5 times
- Joined: Oct 28, 2020 1:14 pm
- Full Name: Lars Freiberger
- Location: Germany
- Contact:
-
- Influencer
- Posts: 11
- Liked: 1 time
- Joined: Feb 07, 2019 1:53 am
- Full Name: Grant GArdner
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Case #07420922
I started seeing this about 2 days ago. Its really random, one run the job will backup just a few hundred MB and then the next it will do 15GB. We typically never have larger than 750MB per run.
I started seeing this about 2 days ago. Its really random, one run the job will backup just a few hundred MB and then the next it will do 15GB. We typically never have larger than 750MB per run.
-
- Product Manager
- Posts: 8207
- Liked: 1328 times
- Joined: Feb 08, 2013 3:08 pm
- Full Name: Mike Resseler
- Location: Belgium
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
@ghgard
Thanks for the case #. To be honest, I don't understand it anymore as MSFT claims they are not making those updates anymore. I will monitor to see if it is again a batch of support cases coming our way
Thanks for the case #. To be honest, I don't understand it anymore as MSFT claims they are not making those updates anymore. I will monitor to see if it is again a batch of support cases coming our way

-
- Veteran
- Posts: 395
- Liked: 56 times
- Joined: Sep 05, 2011 1:31 pm
- Full Name: Andre
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Is there any update regarding this issue? tonight we again had 470GB of Data transfared and running out of Diskspace soon. I lose patient with those (put some not nice words here) at MS...
#07400232
#07400232
-
- Service Provider
- Posts: 97
- Liked: 34 times
- Joined: Oct 31, 2021 7:03 am
- Full Name: maarten
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
For us, the problem disappeared again after a few days. EMEA region.
-
- Veteran
- Posts: 395
- Liked: 56 times
- Joined: Sep 05, 2011 1:31 pm
- Full Name: Andre
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Thanks Maarten, wie had some day with normal traffic (arround 10-15GB) and now again 470GB... In the meantime i got feedback from Veeam Support that MS should have fixed this by today:
https://www.veeam.com/kb4483#:~:text=Ar ... r%203,20th.
Lets hope....
https://www.veeam.com/kb4483#:~:text=Ar ... r%203,20th.
Lets hope....
-
- Veeam ProPartner
- Posts: 576
- Liked: 108 times
- Joined: Dec 29, 2009 12:48 pm
- Full Name: Marco Novelli
- Location: Asti - Italy
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Today I woke up with a Server full of VBO backup... 0 space available
It's a big customer with 700+ seat suffering this space issue since one year
I'm pushing my biggest customers to M365 Cloud Backup solutions, on-premises Server is no more a viable solution
Marco
It's a big customer with 700+ seat suffering this space issue since one year

I'm pushing my biggest customers to M365 Cloud Backup solutions, on-premises Server is no more a viable solution
Marco
-
- Novice
- Posts: 4
- Liked: 1 time
- Joined: Jul 15, 2021 4:28 pm
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
We've been seeing very sporadic full mailbox downloads here and there across our customers, not sure why but probably unrelated to KB4483
I have however one customer where seemingly nobody changed or updated anything and all of a sudden Veeam for M365 decided to make a new, full backup...
There must be a reason, but since I cannot double (again) the size of the volume, I have to delete everything and start from scratch.
I have however one customer where seemingly nobody changed or updated anything and all of a sudden Veeam for M365 decided to make a new, full backup...
There must be a reason, but since I cannot double (again) the size of the volume, I have to delete everything and start from scratch.
-
- Expert
- Posts: 119
- Liked: 12 times
- Joined: Nov 04, 2011 8:21 pm
- Full Name: Corey
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
I believe I may be impacted by this issue. Is there any reason to open a support ticket, the KB seems to indicate there's no workaround? Is there anyways to tell how the storage is consumed within your backups (i.e. daily breakdown between mailboxes, or specific sharepoint sites that are using up more data?) The Storage Consumption report just shows the total storage per day.
-
- Product Manager
- Posts: 10100
- Liked: 2696 times
- Joined: May 13, 2017 4:51 pm
- Full Name: Fabian K.
- Location: Switzerland
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Hi Corey
Best,
Fabian
Did you experience this issue recently or a few weeks ago? According to our information from Microsoft, the situation should have been resolved by now. If you're facing this issue in the last few days, I suggest opening a case with our customer support team to investigate further.I believe I may be impacted by this issue. Is there any reason to open a support ticket, the KB seems to indicate there's no workaround?
Unfortunately not, today the product does not track "backup size" on object-level.Is there anyways to tell how the storage is consumed within your backups (i.e. daily breakdown between mailboxes, or specific sharepoint sites that are using up more data?) The Storage Consumption report just shows the total storage per day.
Best,
Fabian
Product Management Analyst @ Veeam Software
-
- Service Provider
- Posts: 162
- Liked: 14 times
- Joined: Sep 27, 2019 5:06 pm
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Similar issue. Case 07583604.
What do we do to get around this? There has to be a solution, right?
What do we do to get around this? There has to be a solution, right?
-
- Veeam Software
- Posts: 3293
- Liked: 794 times
- Joined: Oct 21, 2011 11:22 am
- Full Name: Polina Vasileva
- Contact:
Re: M365 Mailbox Backup increase since friday / latest August MS Patch installation
Hi squebel,
Thanks for providing your case ID. The problem from your support case does not seem to be related to the increased size of Exchange increments.
Please continue working with our support to investigate your specific case.
Thanks!
Thanks for providing your case ID. The problem from your support case does not seem to be related to the increased size of Exchange increments.
Please continue working with our support to investigate your specific case.
Thanks!
Who is online
Users browsing this forum: No registered users and 9 guests