Google Analytics allows you to easily configure, filter, and focus your site's traffic data in powerful ways. And we want you to avoid the few pitfalls that we have seen around configuration of filters, goals, and e-commerce. For example, when a filter is accidentally implemented incorrectly in a profile, important data can get excluded from that profile's reports. Another example relates to goals: creating a goal in a profile and then changing it is common, but the historical data in that profile will always reflect the first goal, which may not be desirable. For the dates they were implemented, these configurations will unfortunately modify data for that time period permanently.When you duplicate profiles, the new data you collect appears in several profiles at once, letting you manipulate the duplicate data in different ways. You can then keep the original profile unaltered so it can contain every piece of data collected by the tracking code on your site.particular subdirectory here for more information about creating duplicate profiles in your account.Posted by Eliah Gilfenbaum, Google Analytics Team
