$BackupLocation = 'F:\FullBackups'
$S3Bucket = 'MyBucket'
$s3Folder = 'MyServer'

Import-Module -Name AWSPowerShell
Initialize-AWSDefaults -ProfileName MyProfile -Region ap-southeast-2


# FUNCTION – Iterate through subfolders and upload files to S3
function RecurseFolders([string]$path) {
  $fc = New-Object -com Scripting.FileSystemObject
  $folder = $fc.GetFolder($path)
  foreach ($i in $folder.SubFolders) {
    $thisFolder = $i.Path

    # Transform the local directory path to notation compatible with S3 Buckets and Folders
    # 1. Trim off the drive letter and colon from the start of the Path
    $s3Path = $thisFolder.ToString()
    $s3Path = $s3Path.SubString(2)
    # 2. Replace back-slashes with forward-slashes
    # Escape the back-slash special character with a back-slash so that it reads it literally, like so: "\\"
    $s3Path = $s3Path -replace "\\", "/"
    $s3Path = "/" + $s3Folder + $s3Path

    # Upload directory to S3
    Write-S3Object -BucketName $s3Bucket -Folder $thisFolder -KeyPrefix $s3Path
  }

  # If subfolders exist in the current folder, then iterate through them too
  foreach ($i in $folder.subfolders) {
    RecurseFolders($i.path)
  }
}

# Upload root directory files to S3
$s3Path = "/" + $s3Folder + "/" + $sourceFolder
Write-S3Object -BucketName $s3Bucket -Folder $BackupLocation -KeyPrefix $s3Path
$s3Path
# Upload subdirectories to S3
RecurseFolders($BackupLocation)