Veeam has published a guide for Veeam Backup & Replication past week.
The guide contains best practices that it will help you to deploy your backup solution according to your environment with best performance.
You can download the guide from: https://www.gitbook.com/book/poulpreben/veeam-backup-replication-best-practices/details
Update: The book has been updated and it’s covering Veeam Backup & Replication 9 U2