Keeping logs at embedded systems at least is not possible as we don't write them to disk due to limited writecycles of cf-media. If you really want to have historical data use a remote syslog server. At least in non home environments (and even in those sometimes) there should be a machine around that can capture the systemlogs as this is not a heavy task. I even have a server running at home that has some tasks setup to produce today, yesterday, current week, last week rotating logs.
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