14.11.2021 03:00:00 [Info]: Applying historical data retention policy...
14.11.2021 03:00:01 [Error]: Failed to execute request to the database: The DELETE statement conflicted with the REFERENCE constraint "FK_DBWriterSession_TaskSession". The conflict occurred in database "VeeamONE", table "reporter.DBWriterSession", column 'TaskSession'.
It's hard to say what is causing it without seeing the full log files bundle. Please reach out to our support team and let us know your case ID for tracking.