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Re: "...deleted automatically after a period of time..."
It would be great to know what that period of time is, what variable governs it and how it can be adjusted.
Doesn't seem to be triggered by cron and flushing caches does seem to affect it.
As an admin keeping an eye on moodledata folder size, transitioning from 1.9 etc, a better idea of how orphaned files are treated would be really helpful.
--Gavin Stokes 16:51, 9 May 2012 (WST)