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True Image 2021 with Windows 11 Pro

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Three licenses; 2 are Windows 10; 1 is Windows 11

Windows 10 PCs seem to be "happy" as in: the TaskBar status is always accurate

Windows 11 PC is ALWAYS reporting false errors; when I go look at the actual status by Opening Acronis True Image, the "Real" status is always different.

The Windows 11 PC does have multiple BackUp jobs (versus the Windows 10 PCs). Might they be scheduled "too tightly" and creating the following Error (sometimes): Backup failed because a third-party VSS provider had an unexpected error?

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Ed, welcome to these public User Forums.

I haven't seen any similar forum reports with reference to 'third-party VSS provider' errors for any version of Windows.

I would recommend downloading the Acronis VSS Doctor tool and using this to check for any VSS issues, taking the option to let the tool 'Fix Issues' if this is offered.

Beyond this, then the logs for any failing backup tasks would be the next place to check.

Download a copy of the MVP Assistant log viewer tool and use this to look at the logs to see if they show any issues during the operation process?

The latest version of the new log viewer tool is at the link below. 
MVP Assistant update for Acronis Cyber Protect Home Office (Version 1.1.6.0)

If you have Disks & Partitions backups created on ATI 2020 or later using .tibx files, then look in the Backup Worker logs.

If you have Files & Folders backups using .tib files (or Disk backups from earlier versions using .tib files) or using Cloning then look in the Demon logs.

Other logs are shown by the MVP Assistant under the 'Active Logs' heading of the Log Viewer page of the Assistant.

The Schedule2 log contains information related to scheduled task but is one of the more difficult logs to read / work through.

The log files should be zipped to preserve their original file names if sharing in the forums and would need to be less than 3MB in size, otherwise you would need to share the zip file via a Cloud share service such as OneDrive, Dropbox etc.