Hi Anandha Chandrasekaran,
Thanks for Posting your question in Microsoft Q&A
Here’s how Azure Site Recovery works differently for customer-owned sites compared to Azure.
Azure Site Recovery for customer-owned sites (
- You can replicate your on-premises servers/VMs to another customer-owned site and you are responsible for maintaining the disaster recovery infrastructure, including hardware, storage, and networking.
- After the 31-day free trial, the service costs approximately USD 16 per instance per month. This option is ideal if you already have a secondary site and want ASR to manage failover and failback processes.
Azure Site Recovery to Azure (S2A)
- Your on-premises servers or VMs are copied directly into Azure’s cloud. The replicated VMs/servers are stored directly in Microsoft Azure, with Azure providing the disaster recovery infrastructure no need to maintain your own secondary data center.
- After the 31-day free trial, the service costs approximately USD 25 per instance per month. This option is best if you prefer a cloud-based disaster recovery solution without managing physical hardware.
Refer document for Pricing - Site Recovery: https://azure.microsoft.com/en-us/pricing/details/site-recovery/?utm_source
- As Alan Kinane mentioned ASR incur egress charges when failing back
- When you fail back your replicated VMs from Azure to your on-premises site, egress (data transfer out of Azure) charges do apply because data is leaving the Azure data center.
- Azure compresses the replicated data before transfer, which reduces the amount of data and helps lower costs
- Reprotection is when you set up replication back to Azure after failing back to on-premises.
- Ingress (data coming into Azure) is free, so no egress charges occur during reprotection to Azure.
Find more questions on ASR https://learn.microsoft.com/en-us/azure/site-recovery/site-recovery-faq#pricing
Reference documents for more inputs if needed:
https://learn.microsoft.com/en-us/azure/site-recovery/site-recovery-overview?utm_source
https://docs.azure.cn/en-us/site-recovery/failover-failback-overview-modernized
https://learn.microsoft.com/en-us/azure/site-recovery/site-recovery-cost?utm_source
I hope the provided answer is helpful, do let me know if you have any further questions on this Please accept as Yes and upvote if the answer is helpful so that it can help others in the community.