As an organization you need to adopt a business continuity and disaster recovery (BCDR) strategy that keeps your data safe, and your apps and workloads online, when planned and unplanned outages occur.
Azure Recovery Services contributes to your BCDR strategy:
Site Recovery service: Site Recovery helps ensure business continuity by keeping business apps and workloads running during outages. Site Recovery replicates workloads running on physical and virtual machines (VMs) from a primary site to a secondary location. When an outage occurs at your primary site, you fail over to secondary location, and access apps from there. After the primary location is running again, you can fail back to it.
Backup service: The Azure Backup service provides simple, secure, and cost-effective solutions to back up your data and recover it from the Microsoft Azure cloud.
What can I back up?
- On-premises - Back up files, folders, system state using the Microsoft Azure Recovery Services (MARS) agent. Or use the DPM or Azure Backup Server (MABS) agent to protect on-premises VMs (Hyper-V and VMware) and other on-premises workloads
- Azure VMs - Back up entire Windows/Linux VMs (using backup extensions) or back up files, folders, and system state using the MARS agent.
- Azure Managed Disks - Back up Azure Managed Disks
- Azure Files shares - Back up Azure File shares to a storage account
- SQL Server in Azure VMs - Back up SQL Server databases running on Azure VMs
- SAP HANA databases in Azure VMs - Backup SAP HANA databases running on Azure VMs
- Azure Database for PostgreSQL servers (preview) - Back up Azure PostgreSQL databases and retain the backups for up to 10 years
- Azure Blobs (preview) - Overview of operational backup for Azure Blobs (in preview)
Azure Backup offers three types of replication to keep your storage/data highly available.
Locally redundant storage (LRS) replicates your data three times (it creates three copies of your data) in a storage scale unit in a datacenter. All copies of the data exist within the same region. LRS is a low-cost option for protecting your data from local hardware failures.
Geo-redundant storage (GRS) is the default and recommended replication option. GRS replicates your data to a secondary region (hundreds of miles away from the primary location of the source data). GRS costs more than LRS, but GRS provides a higher level of durability for your data, even if there's a regional outage.
Zone-redundant storage (ZRS) replicates your data in availability zones, guaranteeing data residency and resiliency in the same region. ZRS has no downtime. So your critical workloads that require data residency, and must have no downtime, can be backed up in ZRS.
Reference: https://docs.microsoft.com
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