It is possible to go back further than 1 year in the online stats.

Currently a further 4 months are retained. But it is a manual process to view them.

So for example if the last month shown on the "Summary by Month" table is July with the URL of www.example.com/usage/usage_200607.html

You'll find that if you enter ........200606.html or ........200605.html into your browser address bar instead, buy altering the end digits which represent the year/month you can manually go back a further 4 months.