What steps would you take to resolve a production issue where data copying is not working?

First, verify that the data copy process is actually triggered and that the source and destination paths are correct. Check the application logs for any error messages or stack traces. Confirm that the service account or user running the copy has the necessary read/write permissions on both source and target storage. Next, inspect network connectivity and firewall rules to ensure there are no blocked ports or IP restrictions. Look at resource limits such as CPU, memory, and disk I/O on the machine performing the copy; an exhaustion of any of these can cause failures. If the copy is performed via a scheduled job or ETL tool, validate that the job is scheduled correctly and that any dependencies (e.g., upstream data availability) are satisfied. Use a small test dataset to isolate whether the issue is data‑specific or environment‑specific. If the problem persists, enable verbose logging or use a monitoring tool to capture metrics during the copy attempt. Finally, consider implementing retry logic or a fallback mechanism, and document the steps taken for future reference.