Announced as part of a big feature update for Windows Azure, Microsoft has rolled out a public preview for the new Hyper-V Recovery Manager service.
Hyper-V Recovery Manager provides real-time asynchronous replication of VMs sitting in your datacenter, so if there's a site outage, the VMs can be systematically restored.
Just like all other Windows Azure services, Hyper-V Recovery Manager offers both a pay-as-you-go pricing model and a bi-annual and annual subscription. During the public preview, Microsoft is offering a 50% discount with $8 per month per VM for the pay-as-you-go. The bi-annual and annual subscriptions are also 50% off, priced at, roughly, $6.00 per month per protected VM.
Take a look here for pricing and details: Hyper-V Recovery Manager Public Preview