Exchange Online backup, degraded performance, multiple tenants

Question

(CV 11.40.47)We have several Exchange Online backups running for our customers, and each has their own little slice of heaven dedicated to them in our datacenter. They have their own dedicated access Nodes, so they are isolated from each other on our end.We're seeing Exchange Online backup performance is degrading across the board. Because the customers all have their own independent MS365 tenants, it would be strange if this was a Microsoft throttling issue hitting all of them at the same time, no?I am not seeing this performance hit on their Teams, SharePoint, or OneDrive backups.anyone else seeing degraded performance with Exchange?

Syed_S · Answer

Hi​@Unique display nameGood day!You are correct that if each customer has their own independent Microsoft 365 tenant and dedicated access nodes, it is less likely that Microsoft throttling would impact all tenants simultaneously.Throttling is enforced per tenantExchange Online is subject to stricter throttling than Teams, SharePoint, or OneDrive, so performance issues may appear here first.Even with dedicated access nodes, if all tenants are in the same Microsoft region or datacenter, regional throttling or service degradation could occur.For optimal Exchange Online backup performance, ensure you have the recommended number of Azure apps configured per tenant not more than 5 appsEnsure each access node has sufficient CPU, RAM, and disk I/O available. Resource contention or bottlenecks on the access nodes can cause performance degradation.

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