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Microsoft today announced that its Azure Site Recovery service — for backing up companies workloads in the Microsoft public cloud in order to keep them available in the event of a disaster — is now generally available.

Microsoft launched a preview of Azure Site Recovery in June 2014. The service previously went by the name Hyper-V Recovery Manager. In March Microsoft said Azure Site Recovery could handle backup of VMware workloads and physical servers.

And now that the service is generally available, Microsoft really wants companies to try it out — so it’s making a compelling offer.

“Customers can replicate on-premises workloads to Azure with Azure Site Recovery for 31 days at no charge, effectively making migration to Azure free,” Microsoft cloud and enterprise program manager Abhishek Hemrajani wrote in a blog post on the news today.

Disaster recovery is far from the hippest thing that you can do in a public cloud, but it’s important — companies are willing to shell out good money to assure themselves that their applications and data keep running no matter what. VMware itself has a disaster recovery service in its vCloud Air public cloud. Amazon Web Services, the leading public cloud, and Google Cloud Platform do not offer dedicated disaster recovery services. Now that Azure Site Recovery is generally available, that may change soon.

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