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It's definitely possible to offer that on a monthly basis if you model that each customer stays for 36-39 months. Also, I doubt that they are using replicated storage, but are using erasure coding instead. Also, they dedupe before upload, so more cost savings there.

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Spideroak doesn't and cannot dedupe, since everything you upload is encrypted by a key held only by you.

Spideroak can and does dedupe client side before uploading. It can't dedupe across multiple clients, but it does dedupe within the client. It also tracks syncs so that data synced between multiple client machines only has to be stored once (with appropriate redundancy).

That explains why the data are visualized the way they are in the view menu :)

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