SQLPackage.exe filename with the date - cmd

Question

I am trying to automate a backup of an Azure database to my local machine using SQLPackage.exe. I am trying to add the date onto the filename so that every night it doesn't get overwritten.
The following line will pick up the date but will then stop the backup running with the error shown below
CMD
"C:\Program Files (x86)\Microsoft SQL Server\110\DAC\bin\sqlpackage.exe" /Action:Export /ssn:SERVER_NAME_HERE /sdn:DATABASE_NAME /su:USERNAME /sp:PASSWORD /tf:C:\Users\William\Desktop\BackupTest\BACKUPFILE'%date%'.bacpac
ERROR
*** Unrecognized command line argument '23/06/2017'.bacpac'.
I have tried using
+%date%+
+%date
And other options but no luck. Can anyone suggest anything?

Answer 1

More fundamentally, it is not recommend using bacpac to backup database. Bacpac is for load & move data in and out of Azure on demand.
SQLDB on Azure has backup service on by default so a scheduled backup is already provided by the service.
In addition, to properly make a bacpac, the database needs to be copied first then make a bacpac from the copy. Otherwise transactional consistency is not guaranteed and importing the bacpac can fail in the worst case.

Answer 2

You can add it using PowerShell as explained on below example.
Param(
[Parameter(Position=0,Mandatory=$true)]
[string]$ServerName
)
cls
try {
if((Get-PSSnapin -Name SQlServerCmdletSnapin100 -ErrorAction SilentlyContinue) -eq $null){
Add-PSSnapin SQlServerCmdletSnapin100
}
}
catch {
Write-Error "This script requires the SQLServerCmdletSnapIn100 snapin"
exit
}
$script_path = Split-Path -Parent $MyInvocation.MyCommand.Definition
$sql = "
SELECT name
FROM sys.databases
WHERE name NOT IN ('master', 'model', 'msdb', 'tempdb','distribution')
"
$data = Invoke-sqlcmd -Query $sql -ServerInstance $ServerName -Database master
$data | ForEach-Object {
$DatabaseName = $_.name
$now=get-Date
#
# Run sqlpackage
#
&"C:\Program Files (x86)\Microsoft SQL Server\110\DAC\bin\sqlpackage.exe" `
/Action:extract `
/SourceServerName:$ServerName `
/SourceDatabaseName:$DatabaseName `
/TargetFile:$script_path\DACPACs\$DatabaseName$now.dacpac `
/p:ExtractReferencedServerScopedElements=False `
/p:IgnorePermissions=False
}
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com