Add a script for creating backups

scripts/Common/Scripts/Config.ps1

@@ -11,11 +11,18 @@ enum WindowsInstallerStage {
 }
 
 enum SetupStage {
+    Initialize
     Configure
     Install
     CreateUser
 }
 
+enum BackupStage {
+    Initialize
+    Backup
+    BackupUsers
+}
+
 enum UserStage {
     Create
     Configure
@@ -27,6 +34,7 @@ $null = New-Module {
     [string] $configRoot = "HKLM:\Software\PortValhalla";
     [string] $stageOption = "Stage";
     [string] $setupStageOption = "SetupStage";
+    [string] $backupStageOption = "BackupStage";
     [string] $userOption = "SetupUser";
     [string] $userStageOption = "UserStage";
     [string] $accountOption = "MSAccount";
@@ -408,6 +416,39 @@ $null = New-Module {
         $null = Set-SetupOption $setupStageOption $Name;
     }
 
+    <#
+        .SYNOPSIS
+        Gets the name of the current stage of the backup.
+    #>
+    function Get-BackupStage {
+        $stage = Get-SetupOption $backupStageOption;
+
+        if ($null -ne $stage) {
+            $stage = [BackupStage]$stage;
+        }
+
+        return $stage;
+    }
+
+    <#
+        .SYNOPSIS
+        Sets the current stage of the backup.
+
+        .PARAMETER Name
+        The name to set the current stage to.
+    #>
+    function Set-BackupStage {
+        param(
+            $Name
+        )
+
+        if (-not (($null -eq $Name) -or ($Name -is [string]))) {
+            $Name = ([BackupStage]$Name).ToString();
+        }
+
+        $null = Set-SetupOption $backupStageOption $Name;
+    }
+
     <#
         .SYNOPSIS
         Gets the current user to set up.