I am trying to import google analytics data (date, page views, visitors) on a daily basis, and want past data available for reporting / dashboards (kind of like historical invoices).

What are the best practices around doing this?

I created a custom object and custom fields, but it seems like that will be overwritten daily, and won't give me a nicely formatted excel-style list with columns.

Is there a way to create a custom related list, or should I create custom fields within the activity lists and use those?

My longer term plan is to have a number of different custom metrics, imported daily, so I want to start off correctly.

thanks in advance.