60430: Acronis Backup 11.7: backup fails with "Cannot find the file specified"

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Applies to: 

Symptoms

Backup fails with:

Errorcode: 17
Module: 4
Lineinfo: f35f747b3b21f84c
Fields: function : OpenFileW, filename : \\?\C:\ProgramData\Acronis\BackupAndRecovery\MMS\Outbox\30465, $module : mms_vs_43956
Message: The specified file does not exist.
--------------------
Errorcode: 65520
Module: 0
Lineinfo: bd28fdbd64edb8ee
Fields: code : 2147942402, $module : mms_vs_43956
Message: The system cannot find the file specified.

Cause

An antivirus software blocked or deleted Acronis files.

Solution

Add Acronis folders, processes and executables into antivirus exclusions.