Add capabilities to back up apps

scripts/Common/Scripts/Software.ps1

@@ -200,6 +200,7 @@ $null = New-Module {
             [scriptblock] $Backup = $null,
             [scriptblock] $Installer = $null,
             [scriptblock] $Configurator = $null,
+            [scriptblock] $UserBackup = $null,
             [scriptblock] $UserConfigurator = $null,
             [Nullable[InstallerAction]] $Action,
             [hashtable] $Arguments
@@ -262,17 +263,29 @@ $null = New-Module {
                             & $Configurator @argumentList;
                         }
                     }
-                    ([InstallerAction]::ConfigureUser) {
+                    default {
                         if ((-not $Arguments.ContainsKey($userArgument)) -or (-not $Arguments[$userArgument])) {
                             $Arguments.Add($userArgument, ($IsWindows ? $env:UserName : $env:USER));
                         }
 
+                        $user = $Arguments[$userArgument];
+
+                        switch ($_) {
+                            ([InstallerAction]::BackupUser) {
+                                if ($UserBackup) {
+                                    Write-Host "Backing up $Name for user ``$user``…";
+                                    & $UserBackup @argumentList;
+                                }
+                            }
+                            ([InstallerAction]::ConfigureUser) {
                                 if ($UserConfigurator) {
-                            Write-Host "Configuring $Name for user ``$($Arguments[$userArgument])``…";
+                                    Write-Host "Configuring $Name for user ``$user``…";
                                     & $UserConfigurator @argumentList;
                                 }
                             }
                         }
+                    }
+                }
             };
 
             & $installHandler -Action $Action -Arguments $Arguments;

scripts/Common/Types/InstallerAction.ps1

@@ -1,5 +1,7 @@
 enum InstallerAction {
+    Backup
     Install
     Configure
+    BackupUser
     ConfigureUser
 }