Backup retry storms: How you can improve backup reliability

This report analyzes Acronis H2 2025 telemetry and industry guidance to show that uncontrolled backup retries create large "retry storms" that waste CPU, disk I/O, and network bandwidth, identifies primary persistent failure causes (SpaceQuotaReachedHard, VSS writer failures, and connectivity issues), quantifies estimated infrastructure waste, and recommends limiting retries, alerting on policies with more than four runs per day, and specific retry settings per backup type to force root-cause investigation.