61686: Acronis Backup 11.7: backup fails with "Cannot run the task because the task requires a user to be logged on"

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Applies to: 

Symptoms

Scheduled backup starts, but shows no progress. Manual start leads to this error:

Error code: 72
Module: 9
LineInfo: d6e6b1a4069ca4d6
Fields: $module : mms_vs_37613
Message: Failed to run now: error occurred while scheduling the task run request.
--------------------
Error code: 3008
Module: 9
LineInfo: 9e5d09f7da87d0c
Fields: $module : mms_vs_37613
Message: Cannot run the task because the task requires a user to be logged on.

Cause

Acronis Scheduler2 Service is running under a user different from Local System and this user's credentials are incorrect.

The user specified in Plan User is invalid.

Solution

Make sure Acronis Scheduler2 Service runs under Local System.

Recreate the backup plan with correct credentials.