If longer data retention periods are required, the defautl settings will need to be adjusted accordingly for each data point.
Go to "Configuration | Administration | Data Retention" and modify the retention setting for the desired data point. Increasing data retention will contribute to SQL DB growth.
The data trimming process will not trim the past month’s data until the current month is complete. For example if the data retention is set to the one month default setting, the data from February will be archived and available for reporting until the end of March. Therefore, toward the end of any given month, the database could contain almost two month’s data..