Does backing up an Azure database take it down at all?

I have a database in Azure and I am backing it up using

   az sql db export  .....

I need to know does that at all take the database down , affect any running transactions or take it temporarily offline ?

Is there any documentation that explain this?

Solution

As documented here, and export may produce unexpected spikes of DTU consumption in the performance graphs on the Azure Portal even during times of low database activity. So the exports do affect the performance.