Azure Site Recovery Calculator

required Mbps = daily churn GB × VMs × 8,000 ÷ 86,400 seconds; monthly = instance fees + (replica disk + cache) × storage price + monthly churn × cross-region data price. Site Recovery cost has three parts: a flat fee per protected instance, the replica managed disks and cache storage sitting in the target region, and the cross-region data the replication generates. The bandwidth check matters just as much — churn spread evenly over a day still needs a sustained rate, and if the link cannot carry it the recovery point objective silently degrades.

Teams size disaster recovery on storage cost and forget that a 25-VM estate with 20 GB of daily churn each needs roughly 46 Mbps sustained, all day; the first 31 days of protection are free per instance, so short-lived test failovers cost only storage. Confirm the current fees in the Azure pricing calculator.

This calculator takes 8 inputs: VMs protected, Protected instance fee, Replica disk size per VM, Replica storage price per GB, Cache storage as a share of disk, Daily churn per VM, Replication bandwidth available, Cross-region data price per GB. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.