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How to enable volume shadow copy on specific drive (D:, E:,...) and set up schedule using Powershell ?

I just need some hints how to start.

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migrated from stackoverflow.com Apr 13 '11 at 18:35

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We need some more information here. What OS are you using? Which program are you using to do backups? –  Holocryptic Apr 13 '11 at 19:28
Win XP and win 7. And I mean VSS, which is part of win OS. –  Primoz Apr 13 '11 at 19:31

3 Answers 3

up vote 5 down vote accepted

You can create a Shadow copy on a specific drive using WMI object like it's explained in Microsoft Article.

Enable volume shadow copy on specific drive (D:, E:,...) is two things

  1. Creating a shadow copy as shown in the preceding article
  2. Creating a scheduled task to create shadow copy
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Nice. This answer is exactly what I needed. I didn't know that I must create sceduled task. –  Primoz Apr 13 '11 at 21:19

It took me a little while to get this to worked (after finding the simple error causing it to fail), and the function is incomplete. I want to add the ability to enable it on a remote computer, which will probably have to be done via a task that is ran once. If anybody modifies this and adds that, let me know!

function Enable-ShadowCopies {
    [String]$ComputerName = $Env:ComputerName,

$volumeWMI = Get-WmiObject -ComputerName $ComputerName -Class Win32_Volume -Filter "DriveLetter = '$Drive'";
$volumeID = ($volumeWMI.DeviceID.SubString(10)).SubString(0,($volumeWMI.DeviceID.SubString(10)).Length-1);

$scheduler = New-Object -ComObject Schedule.Service
$tskDef = $scheduler.NewTask(0);
$tskRegInfo = $tskDef.RegistrationInfo;
$tskSettings = $tskDef.Settings;
$tskTriggers = $tskDef.Triggers;
$tskActions = $tskDef.Actions;
$tskPrincipals = $tskDef.Principal;

# Registration Info
$tskRegInfo.Author = "PowerShell Script";

# Settings
$tskSettings.DisallowStartIfOnBatteries = $false;
$tskSettings.StopIfGoingOnBatteries = $false
$tskSettings.AllowHardTerminate = $false;
$tskSettings.IdleSettings.IdleDuration = "PT600S";
$tskSettings.IdleSettings.WaitTimeout = "PT3600S";
$tskSettings.IdleSettings.StopOnIdleEnd = $false;
$tskSettings.IdleSettings.RestartOnIdle = $false;
$tskSettings.Enabled = $true;
$tskSettings.Hidden = $false;
$tskSettings.RunOnlyIfIdle = $false;
$tskSettings.WakeToRun = $false;
$tskSettings.ExecutionTimeLimit = "PT259200S";
$tskSettings.Priority = "5";
$tskSettings.StartWhenAvailable = $false;
$tskSettings.RunOnlyIfNetworkAvailable = $false;

# Triggers
$tskTrigger1 = $tskTriggers.Create(3);
$tskTrigger2 = $tskTriggers.Create(3);

## Trigger 1
$tskTrigger1.Id = "Trigger1"
$tskTrigger1.StartBoundary = (Get-Date -format "yyyy-MM-dd")+"T07:00:00";
$tskTrigger1.DaysOfWeek = 0x3E; # Monday - Friday - http://msdn.microsoft.com/en-us/library/windows/desktop/aa384024(v=vs.85).aspx
$tskTrigger1.Enabled = $true;

## Trigger 2
$tskTrigger2.Id = "Trigger2";
$tskTrigger2.StartBoundary = (Get-Date -format "yyyy-MM-dd")+"T12:00:00";
$tskTrigger2.DaysOfWeek = 0x3E; # Monday - Friday - http://msdn.microsoft.com/en-us/library/windows/desktop/aa384024(v=vs.85).aspx
$tskTrigger2.Enabled = $true;

# Principals (RunAs User)
$tskPrincipals.Id = "Author";
$tskPrincipals.UserID = "SYSTEM";
$tskPrincipals.RunLevel = 1;

 # Actions
$tskActions.Context = "Author"
$tskAction1 = $tskActions.Create(0);

# Action 1
$tskAction1.Path = "C:\Windows\system32\vssadmin.exe";
$tskAction1.Arguments = "Create Shadow /AutoRetry=15 /For="+$volumeWMI.DeviceID;
$tskAction1.WorkingDirectory = "%systemroot%\system32";

# Configure VSS, Add scheduled task
vssadmin Add ShadowStorage /For=$Drive /On=$Drive /MaxSize=10%;
$tskFolder = $scheduler.GetFolder("\")
$tskFolder.RegisterTaskDefinition("ShadowCopyVolume$volumeID", $tskDef, 6, "SYSTEM", $null,5);

Even though this works, and it mimics what happens when you do it via the GUI, it still shows as disabled for that drive. But if you enable it, nothing changes! (LOL) I'm guessing there's something that needs to also be modified in the registry.

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+1 for answering with a full script! –  Mark Henderson Jun 10 '12 at 22:19
Need to add $date = Get-Date and $tskFolder = $scheduler.GetFolder("\") –  Jeow Li Huan Jan 5 at 15:49

The best I can do is point you here, and specifically point out this one and this one.

Neither address exactly what you're looking for, but I will point out you can create shadow copies at any point as VSS is a background service that runs until called.

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