Windows Backup Failed Error 0x81000019 — Shadow Copy Creation Error

Fix Windows Backup error 0x81000019 when backup fails because a shadow copy (VSS snapshot) cannot be created for the selected volumes. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Error 0x81000019 indicates Windows Backup cannot create a Volume Shadow Copy (VSS) for the backup. VSS creates a point-in-time snapshot allowing backup of files that are currently open or in use. The shadow copy process requires sufficient free disk space (typically 10-15% of the volume). Multiple VSS providers (Windows built-in, third-party backup software) can conflict. System Protection (restore points) and Windows Backup both use the VSS service. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Insufficient disk space for VSS to create the shadow copy snapshot. Third-party backup or disk management software conflicting with Windows VSS provider. VSS service (Volume Shadow Copy) is stopped, disabled, or in an error state. Corrupted VSS writers preventing the snapshot from being created. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Free up disk space: ensure at least 15% free space on all volumes being backed up. Restart VSS service: services.msc > Volume Shadow Copy > right-click > Restart. Reset VSS writers: open admin Command Prompt, run 'vssadmin list writers' and check for failed writers. Delete old shadow copies: run 'vssadmin delete shadows /all' then retry the backup. Disable third-party backup software temporarily to check for VSS provider conflicts. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Windows Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.