Setting up IaaS VM with SQL Server backup takes 3+ hours

Question from @BobDiddict via Twitter:

Hi Backup Community,

Setting up  backups for my 2 iaas vms. The iis public facing web server finished 45 mins. sql non public facing is going on 3 hrs. not sure if it is working and slow. Or if my ngs or something is blocking it and I just dont know. Any insight would be appreciated.

Thanks,

@AzureSupport