On the 6th day drag the log_file out of the Folder and put in My Documents or something.
Yes. That's what I currently do as a workaround. But this is only a workaround. It should not be a permanent approach.
Hello traders,
I also noticed this behavior in MT5, which automatically deletes Experts log files saved in the C:\Users\...\AppData\Roaming\MetaQuotes\Terminal\...\MQL5\Logs\ folder that are older than 7 days, every time it is opened.
Has anyone found the reason for this and how to disable this automatic deletion?

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MetaTrader stores the experts logs under "C:\Programme\FxPro - MetaTrader\experts\logs".
However there always are only the logs from the last six or seven days. Older logs are somehow deleted.
Does anyone know how those log files are deleted? I'd like to keep all the logs. Thank you.