Backup-AzureCosmosDB.ps1

$cosmosServer = "mycosmos.documents.azure.com:10255" #Define the cosmos db hostname and port
$cosmosUser = "mycosmos-username" #Define username 
$cosmosPassword = "mycosmos-password" #Defines password

$backupDir = "C:\cosmos-backup\$(Get-Date -Format yyyyMMddhhmmss)"
if(!(Test-Path $backupDir)){
   Write-Host "Creating temporary backup directory as $backupDir"
   New-Item -Path $backupDir -ItemType Directory | Out-Null
}
Set-Location $backupDir


$mongoExe = "C:\Program Files\MongoDB\Server\3.6\bin\mongodump.exe"
$arguments = "--host $cosmosServer -u $cosmosUser -p $cosmosPassword --ssl --sslAllowInvalidCertificates --out $backupDir -vvvvv"
Start-Process $mongoExe $arguments -Wait -RedirectStandardError "standarderror.txt" -RedirectStandardOutput "standardoutput.txt"

Write-Host "Displaying standard output:"
Get-Content "standardoutput.txt"
Write-Host "Displaying if any errors:"
Get-Content "standarderror.txt"