Networking
Best Practice
- Utilize a static IPv4 for Veeam Backup for Microsoft 365 server.
- Employ a static IPv4 for Veeam Backup for Microsoft 365 proxy/repository server.
- Create A and PTR records in DNS
- Prefer IPv4 over IPv6
- Use an “as direct as possible” internet connection between the proxies and the Microsoft 365 infrastructure
Explanation
Reliable and stable connectivity between the components, coupled with functional DNS name resolution, is key to preventing hard-to-trace errors.
Direct internet connection
Any kind of proxy or traffic shaping in the connection between Veeam Backup for Microsoft 365 proxies and the Microsoft 365 API servers can significantly impact performance. A slow proxy can extend the sync time which needed to check for changes on a Microsoft 365 object during an incremental backup run, sometimes up to several minutes. Normal sync times for a direct connection are expected to be in the range of 50 to 150 milliseconds.