removed snapshot code, added --use-fs-snapshot

Related changes -

removed folder enumeration and instead point to the root filesystem:
snapshot handling will be better now that changing folders won't group sets

default exlusion list updates:
C:\$Recycle.Bin
C:\$WINDOWS.~BT
C:\$WinREAgent

backup.ps1

@@ -127,29 +127,17 @@ function Invoke-Backup {
     $starting_location = Get-Location
     ForEach ($item in $BackupSources.GetEnumerator()) {
 
-        $ShadowPath = Join-Path $item.Key 'resticVSS'
+        # Get the source drive letter and set as the root path
+        $root_path = $item.Key
 
-        # check for existance of previous, orphaned VSS directory (and remove it) before creating the shadow copy
+        # Avoid storing the drive letter in the backup path if only backing up a single drive
-        if(Test-Path $ShadowPath) {
+        # FIXME: this doesn't really work. "C:\" still gets stored
-            Write-Output "[[Backup]] VSS directory exists: '$ShadowPath' - removing. Past script failure?" | Tee-Object -Append $ErrorLog | Tee-Object -Append $SuccessLog
-            cmd /c rmdir $ShadowPath
-        }
-        
-        # Create the shadow copy
-        $s1 = (Get-WmiObject -List Win32_ShadowCopy).Create($item.Key, "ClientAccessible")
-        $s2 = Get-WmiObject -Class Win32_ShadowCopy | Where-Object { $_.ID -eq $s1.ShadowID }
-        
-        # Create a symbolic link to the shadow copy
-        $device  = $s2.DeviceObject + "\"
-        cmd /c mklink /d $ShadowPath "$device" 3>&1 2>> $ErrorLog | Tee-Object -Append $SuccessLog
-
-        # Build the new list of folders
-        $root_path = $ShadowPath
         if($drive_count -eq 1) {
+            Set-Location $root_path
             $root_path = "."
-            Set-Location $ShadowPath
         }
-
+        
+        # Build the new list of folders from settings (if there are any)
         $folder_list = New-Object System.Collections.Generic.List[System.Object]
         ForEach ($path in $item.Value) {
             $p = Join-Path $root_path $path
@@ -157,30 +145,20 @@ function Invoke-Backup {
         }
 
         # backup everything in the root if no folders are provided
-        # note this won't select items with hidden attributes (a good thing to avoid)
         if (-not $folder_list) {
-            ForEach ($path in Get-ChildItem $ShadowPath) {
+            $folder_list.Add($root_path)
-                $p = Join-Path $root_path $path
-                $folder_list.Add($p)
-            }
         }
 
         # Launch Restic
-        & $ResticExe backup $folder_list --exclude-file=$WindowsExcludeFile --exclude-file=$LocalExcludeFile 3>&1 2>> $ErrorLog | Tee-Object -Append $SuccessLog
+        & $ResticExe backup $folder_list --use-fs-snapshot --exclude-file=$WindowsExcludeFile --exclude-file=$LocalExcludeFile 3>&1 2>> $ErrorLog | Tee-Object -Append $SuccessLog
         if(-not $?) {
             Write-Output "[[Backup]] Completed with errors" | Tee-Object -Append $ErrorLog | Tee-Object -Append $SuccessLog
             $return_value = $false
         }
-
-        # Delete the shadow copy and remove the symbolic link
-        if($drive_count -eq 1) {
-            Set-Location $starting_location
-        }
-        $s2.Delete()
-        cmd /c rmdir $ShadowPath
-
-        Write-Output "[[Backup]] End $(Get-Date)" | Tee-Object -Append $SuccessLog
     }
+    
+    Set-Location $starting_location
+    Write-Output "[[Backup]] End $(Get-Date)" | Tee-Object -Append $SuccessLog
 
     return $return_value
 }

windows.exclude

@@ -1,23 +1,25 @@
 # default excludes
 # examples https://github.com/duplicati/duplicati/blob/master/Duplicati/Library/Utility/FilterGroups.cs
-# note, because we're using a VSS directory, we can use that as the root dir for exclude rules (i.e. resticVSS)
+C:\hiberfil.sys
-resticVSS\hiberfil.sys
+C:\pagefile.sys
-resticVSS\pagefile.sys
+C:\swapfile.sys
-resticVSS\swapfile.sys
+C:\$Recycle.Bin
-resticVSS\$Recycle.Bin
+C:\autoexec.bat
-resticVSS\autoexec.bat
+C:\Config.Msi
-resticVSS\Config.Msi
+C:\Documents and Settings
-resticVSS\Documents and Settings
+C:\Recycled
-resticVSS\Recycled
+C:\Recycler
-resticVSS\Recycler
+C:\$$Recycle.Bin
-resticVSS\System Volume Information
+C:\System Volume Information
-resticVSS\Recovery
+C:\Recovery
-resticVSS\Program Files
+C:\Program Files
-resticVSS\Program Files (x86)
+C:\Program Files (x86)
-resticVSS\ProgramData
+C:\ProgramData
-resticVSS\PerfLogs
+C:\PerfLogs
-resticVSS\Windows
+C:\Windows
-resticVSS\Windows.old
+C:\Windows.old
+C:\$$WINDOWS.~BT
+C:\$$WinREAgent
 Microsoft\Windows\Recent
 Microsoft\**\RecoveryStore*
 Microsoft\**\Windows\*.edb
@@ -32,7 +34,7 @@ UsrClass.dat
 Dropbox
 AppData\Local\Google\Drive
 Google Drive\.tmp.drivedownload
-resticVSS\OneDriveTemp
+C:\OneDriveTemp
 
 # browsers
 Google\Chrome