If Azure SQL backups are running slowly, consider the following troubleshooting steps.
Test with SQLPackage Utility
If you suspect that the number of Import/Export compute VMs in your region is a limiting factor, run a test backup using the SQLPackage utility directly from the access node. This can help determine whether:
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Regional compute VM availability is causing delays, or
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General performance issues exist in the environment.
Additional Troubleshooting Resources
For more information about diagnosing long-running import or export operations, refer to: