Cost Estimator calculations
Amol Dalvi
The Cost Estimator makes some assumptions while calculating inregion backup costs 
 Storage type: LRS
 Backup frequency: daily
 Backup retention: 30 days
 Average space utilization on disk: 50% (assuming half of the space on all disks is actual data)
 Delta of data: 2% daily (2% of data changes on a daily basis)

While calculating the DR costs, the following assumptions are made:
 Every VM in the deployment is protected (protecting select VMs will reduce the cost)
 Not taking into account the first 31 days of ASR license being free (assume ASR license cost starts from day 1)
 ASR destination is another Azure region
 Using same storage in DR as in production (e.g. premium vs. standard and managed disks vs. unmanaged disks)
 No transaction costs for Standard storage are estimated
 ASR license cost (currently $25/month per instance) * (# of server VMs + # of desktop VMs)
 Storage cost of servers and desktops in production environment (excluding RDS Collection scale sets, which are created on demand)

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