I used to get a lot more info from Virtuozo when I log in. For example I could compare traffic of the whole VPS month to month. I cannot see to do that anymore as the system is limited. Unless I am missing a tool.
You should have options where you can click on day/week/month/year.
Such as the 4 different images in this link: http://keetweej.vanheusden.com/stats/munin/belle/belle-df.html