Google Analytics Stores Data for 25 Months
A Google Analytics Help thread has confirmation from a Googler that your Analytics data will remain in your account for at least the past 25 months.
Anna from the Google Analytics team said, "data is stored for at least 25 months," when using Google Analytics.
After that, I guess you should export the data and save it locally. Is 25 months enough for you? Personally, I am not too sure. Here is a poll, let me know what you think:
Forum discussion at Google Analytics Help.
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rustybrick in Tracking & Conversion Measurements at March 30, 2009 8:30 AM
Comments (5)

Comments
No, of course. When it's free it never enough. But if we have to pay, then some people might find it enough for them :)
Posted by Oscar R at March 30, 2009 09:33