How often are you backing up?  Fulls, Differentials, Incrementals?  How long do you want to keep each?  How compressible is your data?  How much does the data change?  How often does the data change?

Too many variables to answer your questions as given.

Only full backups, once a month, you'd need 200GB x 12 (ignoring compression) = 2.4TB

On Tue, Oct 27, 2015 at 4:08 PM, Thing <thing.thing AT gmail DOT com> wrote:

Hi,

To backup 200gb with 1 year retention roughly how big a disk would be required?  2tb? 3tb?

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