- When NSG flow logs are enabled, flow log records are written to the configured Azure Storage account. To generate Traffic Analytics insights, Azure Network Watcher performs backend operations on this stored data to process, aggregate, and enrich flow log records. These backend storage interactions are required for analytics functionality and occur even if you don't actively query the data. You can control the overall cost impact by adjusting flow log scope, retention, and whether Traffic Analytics is enabled. For more information, see [NSG flow logs pricing](/azure/network-watcher/nsg-flow-logs-overview?tabs=Americas#pricing).
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