Hi ,
Please check if any other process is running and utilizing more CPU and memory.
The time taken is dependent on a host of factors like network latency, available IOPS on the primary storage account, available IOPS on the backup storage account etc, so we would need to isolate exactly what is causing this delay.
Have you checked the operation logs to see if it shows anything that might help us. Any error/warning in the event viewer?
In addition, since windows server 2003 is out of support. It is suggested you upgrade your server.
Best Regards,