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Would this help to reduce the size supposedly (as we do not use graphing feature at all, and we just need to retain 1 previous month of logs):
zimbraLogSummaryLifetime: 730d --> 60d
zimbraLogRawLifetime: 31d --> ??? (any recommendation?)
The raw logs shouldn't be too large even with the 31d retention if you're using a current build of Zimbra, it would depend to some extent on the activity of your server.