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Is WAN accelerators only useful for backing up VMs and OS's ?


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I’ve been reading examples of backing up VMs and OS where the Veeam WAN accelerators are beneficial. But what about agent based backups of SQL server, Files, Exchange etc. Does it offer any benefit when used to send such backup data to offsite ?

Best answer by Geoff Burke

As was stated, they won’t work with agents. You need to have them on both ends of the connection. I honestly never got much use out of them. In fact I saw them more as a WAN cache which had value when Telco’s were charging for the amount of data being transferred but did not see performance increases. There is the new High Bandwidth mode which I never used extensively, just remember that has to be set at both ends for it to work otherwise it defaults back to the normal mode.

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11 comments

Chris.Childerhose
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  • January 13, 2024

WAN accelerators only work with VBR and not so much agents.  They do not benefit them as much as VM backups and OSs.


coolsport00
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  • January 13, 2024

WAN Accelerators are only for Copy and Replication jobs as noted in the User Guide


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  • January 14, 2024

It looks like it does offer some benefit. I am seeing a 50% reduction of data size transferred to offsite copy on a job that contains non OS/VM data.


coolsport00
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  • January 14, 2024

For a Copy job? WAN Accelerators do offer benefit for such jobs over low WAN speed networks. Proxies offer benefit over high-speed WAN networks.


Geoff Burke
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  • January 14, 2024

As was stated, they won’t work with agents. You need to have them on both ends of the connection. I honestly never got much use out of them. In fact I saw them more as a WAN cache which had value when Telco’s were charging for the amount of data being transferred but did not see performance increases. There is the new High Bandwidth mode which I never used extensively, just remember that has to be set at both ends for it to work otherwise it defaults back to the normal mode.


Chris.Childerhose
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  • January 14, 2024
Arin wrote:

It looks like it does offer some benefit. I am seeing a 50% reduction of data size transferred to offsite copy on a job that contains non OS/VM data.

Nice to see that it is of some benefit to you but seems odd it would work that way.  Be interested to hear more from your tests.


Scott
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  • January 15, 2024

I replicate a ton of data and don’t use them. If I had a slower link, or unstable link it might be something to consider. with 10Gb network though my proxies do just fine. 


dloseke
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  • January 17, 2024

I have used them, but I don’t see as much benefit.  The main benefit I’ve seen is if I’m copying data that is duplicated across multiple VM’s across the link, then it will deduplicate that data flow due to the caching.  But in all honestly, especially on fast links, it’s not all that beneficial.  There was also a time where you could get corruption in the accelerator cache and it caused for slower link.  In general, I just don’t use them.


coolsport00
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  • January 24, 2024

Hi @Arin -

Need any further info here? Did we provide you with sufficient info?


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  • February 26, 2025

NOT SURE IF THE WAN ACCELERATOR DOES ANYTHING IF THE CUSTOMER BACKUP IS ENCRYPTED.  12.3 ON THE CSP SIDE CAN NO LONGER IMPORT.  WAN CACHE IS EMPTY. 


Chris.Childerhose
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  • February 26, 2025
MikeC wrote:

NOT SURE IF THE WAN ACCELERATOR DOES ANYTHING IF THE CUSTOMER BACKUP IS ENCRYPTED.  12.3 ON THE CSP SIDE CAN NO LONGER IMPORT.  WAN CACHE IS EMPTY. 

Is there really a need for all caps?  🙄