Backup-Azure.ps1

	$source = "C:\Scripts"
	$archiveDestination = "C:\ScriptsArchive"
	$type = "ps1"
	$offsiteDrive = "M"

	#Create mapping if missing
	.\Map-Azure.ps1 -DriveLetter "$offsiteDrive" -StorageKey "[storage key]"
	
	#Copy files to Archive
	.\Migrate-Files.ps1 -Source "$source\*.$type" -Destination $archiveDestination
	
	#Remove items that are not from todays backup
	$date = Get-Date -Format yyyyMMdd
	Remove-Item -Path "${archiveDestination}\*.$type" -exclude "*$date*"
	
	#Move files to storage account. They will be destroyed
	.\Migrate-Files.ps1 -Source "$source\*.$type" -Destination "${offsiteDrive}:\" -Remove
	
	#Remove remote backups that are not from todays backup
	$date = Get-Date -Format yyyyMMdd
	Remove-Item -Path "${offsiteDrive}:\*.$type" -exclude "*$date*"

Map-Azure.ps1

param (
    [string]$DriveLetter,
    [string]$StorageKey
)

if (!(Test-Path "${DriveLetter}:"))
{
    cmd.exe /c "net use ${DriveLetter}: \\[storage folder location] /u:[username] ""${StorageKey}"""
}

Migrate-Files.ps1

param(
    [string]$Source, 
    [string]$Filter, 
    [string]$Destination,
    [switch]$Remove=$False
)

#Test if source path exist
if((Test-Path -Path $Source.trim()) -ne $True) {
    throw 'Source did not exist'
} 

#Test if destination path exist
if ((Test-Path -Path $Destination.trim()) -ne $True) {
    throw 'Destination did not exist'
}

#Test if no files in source
if((Get-ChildItem -Path $Source).Length -eq 0) {
    throw 'No files at source'
}

if($Remove)
{
    #Move-Item removes the source files
    Move-Item -Path $Source -Filter $Filter -Destination $Destination -Force
} else {
    #Copy-Item keeps a local copy
    Copy-Item -Path $Source -Filter $Filter -Destination $Destination -Force
}

return $True