Backup of virtual machines finishes with warnings:
Error code: 102
Message: Creating a crash-consistent snapshot of virtual machine 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX' because the creation of its application-consistent snapshot has failed.
Error code: 138
Message: Failed to create the virtual machine snapshot (Machine: 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'; Name: 'AcronisBackup').
If you are backing up Linux virtual machines or virtual machines with dynamic disks on a Hyper-V host: application-consistent snapshot is naturally (by hypervisor itself) not supported for Linux virtual machines or virtual machines with Windows dynamic disks running on a Hyper-V host.
To prevent these warnings, disable the VSS for virtual machines backup option:
- Open the backup plan for editing.
- Click the gear icon to open settings.
- Set Volume Shadow Copy Service (VSS) for virtual machines to disabled.
If this warning appears during a backup of a Windows virtual machine without dynamic disks, make sure that either the latest Integration Services (for Hyper-V environment) or VMware tools (for ESX(i) environment) are installed inside the affected VM. For Windows Server 2008R2 you can use integration tools from Windows Server 2012R2.
If the issue still persists, follow Acronis Backup: virtual machine backup troubleshooting guide.
You can set Volume Shadow Copy Service (VSS) for virtual machines to disabled until the issue is resolved.