Function channel_folders 

pub(crate) fn channel_folders(
    root: &Path,
    cutoff: NaiveDate,
) -> Result<Vec<PathBuf>>

Lists asset<NNN>/<YYYY-MM-DD>/ch<NN> folders under root older than cutoff.

Leftovers from an interrupted run are cleaned up with recover on the way.

Arguments

• root - Archive root.
• cutoff - Days on or after this date are not listed.

Errors

Returns an error if a folder cannot be listed or recovered.