We have found that,  although some economies of scale do exist, the simplest math is this : Take the total active storage space in use by your servers (let’s say 1TB for our example). Because you need both on- and off-premises storage, and the storage required for backups is roughly 3:1, you’ll need 3TB for backups.  A good rule of thumb is $0.10/GB/month or $300/month for your 1TB. Because there is hardware involved, we offer this kind of pricing with a three-year agreement. That price includes everything—licensing, on-site hardware, cloud storage, management, reporting, and emergency services.