Azure Powershell - automating Login-AzureRmAccount AD Login - for Azure function

Question

I have this Azure Powershell script, which successfully backs up a SQL Azure DB to Azure Blob.

In its current form, it requires me to log in via AD.

I now n

Answer 1

1. Yes, you can use that route, or use certificate auth, or use an Azure AD user, it can login with user\password, but is considered less secure than service principal.
2. Yes, you can use one service principal for any number of Azure Functions you would like to.