function ReplaceInvalidFilenameChars {
    param(
        [string]
        $text,
        [string]
        $substition
    )

    foreach ($c in [System.IO.Path]::GetInvalidFileNameChars()) {
        $text = $text.Replace($c, $substition)
    }

    return $text
}

function ReplaceInvalidPathChars {
    param(
        [string]
        $text,
        [string]
        $substition
    )

    foreach ($c in [System.IO.Path]::GetInvalidPathChars()) {
        $text = $text.Replace($c, $substition)
    }

    return $text
}

Connect-ManagementServer

foreach ($recorder in Get-RecordingServer) {
    $cameras = $recorder | Get-Hardware | Where-Object Enabled |
        Get-Camera | Where-Object Enabled
    foreach ($camera in $cameras) {
        $fileName = ReplaceInvalidFilenameChars "$($camera.Name).jpg" "-"
        $path = ReplaceInvalidPathChars "C:\snapshots\$($recorder.Name)" "-"
        if (-not (Test-Path $path)) {
            New-Item $path -ItemType Directory
        }
        $camera | Get-Snapshot -Path $path -FileName $fileName -Live -Save
    }
}