Proxy Servers
The sizing of Veeam Backup for Microsoft 365 Proxies depends on the total number of objects to protect. Refer to the Configuration Maximums to determine the necessary number of proxies and the capacity for handling various object types, such as Mail, Archive, Site, OneDrive, and Teams.
When sizing Veeam Backup for Microsoft 365 Proxies, two essential Veeam Backup for Microsoft 365 parameters need consideration:
- Number of threads
- Amount of bandwidth
Number of threads
The number of active connections started by Veeam Backup for Microsoft 365 Proxy, is responsible for backing up data. ranges from 0 to 256. A higher number potentially speeds up the backup job completion. The default number of Veeam Backup for Microsoft 365 Proxy connections is 64. While it is possible to modify this number, setting a thread number too high may trigger the “Throttling Policy” activated by Microsoft 365 to manage the resources required by external clients/connections.
It is advisable to monitor sample “test jobs” to verify and adjust the number of threads. Experiencing a very high CPU and memory load is an indicator of a misconfigured (too high) thread number.
Amount of bandwidth
Represents the network throughput shared across the number of configured threads. By default, it is set to unlimited. In this scenario, all the available bandwidth to the server running as Veeam Backup for Microsoft 365 Proxy will be utilized. However, best practice dictates limiting the maximum amount of bandwidth Veeam Backup for Microsoft 365 Proxy can use. It is important to note that the Veeam Backup for Microsoft 365 Proxy might not necessarily use the maximum configured bandwidth, as this also depends on Microsoft 365 throttling, which limits the connection speed. Regardless, the bandwidth is always shared across the number of threads.