Error "A device which does not exist was specified" or "The device is not ready"

This is a VSS snapshot error. It indicates that the VSS snapshot may have been destroyed while the backup was in progress. VSS snapshots can be destroyed manually by malware, or by 'cleanup' type programs. They can also be destroyed if the device is low on disc space, and the device uses space in the 'shadow' area where the snapshot is being put together.

The error messages appears similar to: "Open failed because: open \?\GLOBALROOT\Device\HarddiskVolumeShadowCopy16\FOLDER\FOLDER\FILE: A device which does not exist was specified", and "Error for \?\GLOBALROOT\Device\FOLDER\FOLDER\FILE: BackupRead \?\GLOBALROOT\Device\FOLDER\FOLDER\FILE: The device is not ready".

• Run the backup again to see if the problem still persists - the issue may have been temporary.
• Check the disk space on the device - low disk space is outside of Magnus Box's control.