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by byoung2 4539 days ago
Dropbox stores all user data in S3:

Once a file is added to your Dropbox, the file is then synced to Dropbox's secure online servers. All files stored online by Dropbox are encrypted and kept securely on Amazon's Simple Storage Service (S3) in multiple data centers located across the United States.

You can find more information about Amazon S3 or learn about Amazon S3’s security measures on the Amazon website.

https://www.dropbox.com/help/7/en