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#### 6.8.1 The NNDiary Back End

`nndiary` is a back end very similar to `nnml` (see Mail Spool). Actually, it could appear as a mix of `nnml` and `nndraft`. If you know `nnml`, you’re already familiar with the message storing scheme of `nndiary`: one file per message, one directory per group.

Before anything, there is one requirement to be able to run `nndiary` properly: you must use the group timestamp feature of Gnus. This adds a timestamp to each group’s parameters. Group Timestamp to see how it’s done.