PowerShell sync script delete remote files and start over again

# Load WinSCP .NET assembly
Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"
 
# Session.FileTransferred event handler
 
function FileTransferred
{
    param($e)
 
    if ($e.Error -eq $Null)
    {
        Write-Host "Upload of $($e.FileName) succeeded"
    }
    else
    {
        Write-Host "Upload of $($e.FileName) failed: $($e.Error)"
    }
 
    if ($e.Chmod -ne $Null)
    {
        if ($e.Chmod.Error -eq $Null)
        {
            Write-Host "Permissions of $($e.Chmod.FileName) set to $($e.Chmod.FilePermissions)"
        }
        else
        {
            Write-Host "Setting permissions of $($e.Chmod.FileName) failed: $($e.Chmod.Error)"
        }
 
    }
    else
    {
        Write-Host "Permissions of $($e.Destination) kept with their defaults"
    }
 
    if ($e.Touch -ne $Null)
    {
        if ($e.Touch.Error -eq $Null)
        {
            Write-Host "Timestamp of $($e.Touch.FileName) set to $($e.Touch.LastWriteTime)"
        }
        else
        {
            Write-Host "Setting timestamp of $($e.Touch.FileName) failed: $($e.Touch.Error)"
        }
 
    }
    else
    {
        # This should never happen during "local to remote" synchronization
        Write-Host "Timestamp of $($e.Destination) kept with its default (current time)"
    }
}
 
# Main script
 
try
{
    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
        Protocol = [WinSCP.Protocol]::Ftp
        HostName = "DOMAINHERE"
        PortNumber = PORT
        UserName = "USERNAME"
        Password = "PASSWORD"
        FtpSecure = [WinSCP.FtpSecure]::Explicit
        TlsHostCertificateFingerprint = "THE LONG CERTIFICATE FINGERPRINT"
    }
 
    $transferOptions = New-Object WinSCP.TransferOptions
    $transferOptions.FileMask = "*.*| System Volume Information/"
 
    $session = New-Object WinSCP.Session
    try
    {
        # Will continuously report progress of synchronization
        $session.add_FileTransferred( { FileTransferred($_) } )
 
        # Connect
        $sessionLogPath="C:\ftp\session.log"
        $session.SessionLogPath = $sessionLogPath
        $session.Open($sessionOptions)
 
        # Synchronize files
        $synchronizationResult = $session.SynchronizeDirectories(
            [WinSCP.SynchronizationMode]::Remote, "V:\", "/backup/g", $False, $false, [WinSCP.SynchronizationCriteria]::Time, $transferOptions)
 
        # Throw on any error
        $synchronizationResult.Check()
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch
{
    Write-Host "Error: $($_.Exception.Message)"
    exit 1
}