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Re:XKeyscore: NSA program collects 'nearly everything a user... by runn1ng on Wednesday July 31, 2013 @09:38AM (#6133536)
From the article

The XKeyscore system is continuously collecting so much internet data that it can be stored only for short periods of time. Content remains on the system for only three to five days, while metadata is stored for 30 days. One document explains: "At some sites, the amount of data we receive per day (20+ terabytes) can only be stored for as little as 24 hours."

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