Powershell script for SnapRaid to create ShadowCopies before syncing and using shadow copies for sync.

snapraid.ps1

$path = "C:\SnapRaid\"
$exepath = $path + "snapraid.exe"
$config = $path +"snapraid.conf"
$config_shadow = $path + "snapraid_shadow2.conf"
$data = Get-Content $config
$file = New-Object System.IO.StreamWriter $config_shadow
$now = Get-Date

$logfile = $path + "SnapRAID-$(get-date -format yyMMdd-HHmmss).log"  
$log = New-Object System.IO.StreamWriter $logfile

function writeLog($txt)
{
    $log.WriteLine($txt)
}

writeLog("Start")

Set-Location $path

function GetShadowCopy($Ltr)
{
    $Ltr = $Ltr.Trim("\\")
    $Disk = Get-WmiObject -Class Win32_Volume | Where { $_.DriveLetter -eq $Ltr }
    $LastSnap = (Get-WMIObject win32_shadowcopy) | Where { $_.VolumeName -eq $Disk.DeviceId -and $_.ClientAccessible -eq $true } | Sort InstallDate | Select-Object -Last 1
    return $LastSnap
}

function CreateShadowCopy($Ltr)
{
    if ((Get-WmiObject Win32_ShadowCopy -List).Create($Ltr,"ClientAccessible"))
    {
        return GetShadowCopy($Ltr)
    }
    throw "ShadowCopy Failed"
}


# Search Disks in config file
foreach ( $l in $data )
{
    if ( $l.StartsWith("disk") )
    {
        $tmp = $l.Split(" ")
        writeLog("Cheking shadow copy for: "+$tmp[2])

        $sc = GetShadowCopy($tmp[2])

        if ($sc)
        {
            $Dt = [system.management.managementdatetimeconverter]::todatetime(($sc).InstallDate)

            if ($now.Subtract($Dt).TotalHours -gt 12)
            {
                writeLog("Updating shadow copy for: " + $tmp[2])
                $sc = CreateShadowCopy($tmp[2])
            }
    		else
			{
				writeLog("Skipping, less than 12 hours old")
			}
        }
        else
        {
            writeLog("Creating shadow copy for: " + $tmp[2])
            $sc = CreateShadowCopy($tmp[2])
        }

        $file.WriteLine("disk "+ $tmp[1] + " " + $sc.DeviceObject + "\")
    }
    else
    {
        $file.WriteLine($l)
    }
}

writeLog("Launching snapraid...")

$file.Close()
$log.Close()

& $exepath sync -c "$config_shadow" | out-file $logfile

exit 0