When license auto update is enabled for Rental licenses (per-VM licensing), Veeam Backup & Replication additionally performs automatic usage logging.
As part of logging, Veeam Backup & Replication collects statistics on the current license usage and periodically sends a report to the Veeam License Update Server. The report provides information about the maximum number of VMs that were managed by Veeam Backup & Replication over the past week (high watermark). The process runs in the background mode, once a week at a random time and day.
The collected data allows Veeam back-end system to automatically approve your monthly usage reports as long as they do not deviate from high watermark value significantly. This helps keep Veeam report processing costs low, thus allowing Veeam to maintain low rental prices for the solution.