private IFakeFile CreateArchiveFile(DateTime date, string base64Content)
        {
            DateTime now = _now;

            _now = date; // By setting the "_now" the virtual file will have the correct time stamp.
            var file = _fileSystem.SetFileFromBase64(LOG_DIR + $"Archived_{date:yyyyMMdd}.zip", base64Content);

            _now = now;
            return(file);
        }