ShadowCopy Backup Script (PowerShell)

A simple PowerShell script that automates backup tasks using Windows Shadow Copy and Robocopy, with support for rotation and progress tracking.

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Features

• Creates a Shadow Copy of a selected volume
• Uses Robocopy to copy only selected file types from specific directories
• Supports multiple source directories
• Displays a native Windows progress bar
• Allows cancellation mid-process
• Supports backup rotation (keeps N previous versions)
• Cleans up shadow copy and symlink after execution

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Requirements

• Windows OS (with Volume Shadow Copy enabled)
• PowerShell 5.1+
• Admin rights required (to use vssadmin and mklink)
• Robocopy (included in Windows)

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🔧 Configuration

Inside the script, you can modify:

$VSV = "D:"                       # Volume to snapshot
$DIRSOURCE = @("\data\")       # Directories to back up (relative to root of volume)
$DIRDEST = "\\backup-nas\"    # Destination for backups (network path or local)
$EXT = "*.db"                    # File types to copy (use *.* for all)
$Shortc = "shadowcopy"           # Symlink name
$DELBCK = $true                  # Whether to delete shadow copy after run
$NBRBACKUP = 3                   # How many backup folders to retain
$MTNB = 8                        # Robocopy thread count

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Example Usage

1. Open PowerShell as Administrator
2. Run the script:

   .\shadowcopy_backup.ps1

3. Backups are saved in numbered folders (1, 2, 3, ...) inside the target directory.
4. A log file is created automatically:
   backup_YYYY-MM-DD_HH-MM-SS.log

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Cleanup

If $DELBCK = $true, the script will:

• Remove the created symlink
• Delete the shadow copy

If not, you’ll need to delete them manually using:

vssadmin delete shadows /for=D: /all /quiet
rmdir D:\shadowcopy

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License

This script is provided under the MIT License.
Feel free to modify and adapt it for personal or professional use.

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Credits

Created by orugari
Inspired by early backup batch techniques and modernized in PowerShell.