From our initial costing in Azure, using Tim Dewin's RPS tool as Michael suggested (http://rps.dewin.me/
), along with the Azure calculator, we've come up with the following figures.
50TB Block Blob Storage (Basic tier, LRS, Cool Access Tier, 40TB data write per month) - £486.25
per month (€550.18)
10TB Restore Cost - £83.95
This is for the UK South
region so obviously prices may vary but it should give you a good starting point