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Contributors all In this article Azure Backup is the Azure-based service you can use to back up or protect and restore your data in the Microsoft cloud. Azure Backup replaces your existing on-premises or off-site backup solution with a cloud-based solution that is reliable, secure, and cost-competitive.
Azure Backup offers multiple components that you download and deploy on the appropriate computer, server, or in the cloud. The component, or agent, that you deploy depends on what you want to protect. All Azure Backup components no matter whether you're protecting data on-premises or in the cloud can be used to back up data to a Recovery Services vault in Azure. See the Azure Backup components table later in this article for information about which component to use to protect specific data, applications, or workloads.
Traditional backup solutions have evolved to treat the cloud as an endpoint, or static storage destination, similar to disks or tape. While this approach is simple, it is limited and doesn't take full advantage of an underlying cloud platform, which translates to an expensive, inefficient solution. Other solutions are expensive because you end up paying for the wrong type of storage, or storage that you don't need.
Other solutions are often inefficient because they don't offer you the type or amount of storage you need, or administrative tasks require too much time. In contrast, Azure Backup delivers these key benefits:. Automatic storage management - Hybrid environments often require heterogeneous storage - some on-premises and some in the cloud. With Azure Backup, there is no cost for using on-premises storage devices. Azure Backup automatically allocates and manages backup storage, and it uses a pay-as-you-use model.
Pay-as-you-use means that you only pay for the storage that you consume. For more information, see the Azure pricing article. Unlimited scaling - Azure Backup uses the underlying power and unlimited scale of the Azure cloud to deliver high-availability - with no maintenance or monitoring overhead. You can set up alerts to provide information about events, but you don't need to worry about high-availability for your data in the cloud. Multiple storage options - An aspect of high-availability is storage replication.
Azure Backup offers two types of replication: Choose the backup storage option based on need:. 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. Unlimited data transfer - Azure Backup does not limit the amount of inbound or outbound data you transfer. Azure Backup also does not charge for the data that is transferred.
For more information about this cost, see Offline-backup workflow in Azure Backup. Outbound data refers to data transferred from a Recovery Services vault during a restore operation. Data encryption - Data encryption allows for secure transmission and storage of your data in the public cloud. You store the encryption passphrase locally, and it is never transmitted or stored in Azure. If it is necessary to restore any of the data, only you have encryption passphrase, or key.
Application-consistent backup - An application-consistent backup means a recovery point has all required data to restore the backup copy. Azure Backup provides application-consistent backups, which ensure additional fixes are not required to restore the data.
Restoring application-consistent data reduces the restoration time, allowing you to quickly return to a running state. Long-term retention - You can use Recovery Services vaults for short-term and long-term data retention.
Azure doesn't limit the length of time data can remain in a Recovery Services vault. You can keep data in a vault for as long as you like. Azure Backup has a limit of recovery points per protected instance. See the Backup and retention section in this article for an explanation of how this limit may impact your backup needs.
Use the following table for information about what you can protect with each Azure Backup component. The following table provides a matrix of the data and workloads that can be protected using Azure Backup. The Azure Backup solution column has links to the deployment documentation for that solution. Premium Storage is attractive for virtual machine VM workloads. For more information about Premium Storage, see the article, Premium Storage: The size of the staging location is equal to the size of the recovery point snapshot.
Be sure the Premium Storage account has adequate free space to accommodate the temporary staging location. For more information, see the article, premium storage limitations. Once the backup job finishes, the staging location is deleted. The price of storage used for the staging location is consistent with all Premium storage pricing. Azure Backup protects managed disk VMs.
Managed disks free you from managing storage accounts of virtual machines and greatly simplify VM provisioning. In the Azure portal, you can configure the backup job directly from the Virtual Machine view or from the Recovery Services vault view.
You can back up VMs on managed disks through RestorePoint collections built on top of managed disks. Azure Backup allows you to restore a complete VM with managed disks, or restore managed disks to a storage account.
Azure manages the managed disks during the restore process. You the customer manage the storage account created as part of the restore process. When restoring managed encrypted VMs, the VM's keys and secrets should exist in the key vault prior to starting the restore operation.
The following sections provide tables that summarize the availability or support of various features in each Azure Backup component. See the information following each table for additional support or details. The Recovery Services vault is the preferred storage target across all components. Backups are compressed to reduce the required storage space. The only component that does not use compression is the VM extension. The VM extension copies all backup data from your storage account to the Recovery Services vault in the same region.
No compression is used when transferring the data. Transferring the data without compression slightly inflates the storage used. However, storing the data without compression allows for faster restoration, should you need that recovery point. Windows Server performs data deduplication at the host level on virtual hard disks VHDs that are attached to the virtual machine as backup storage. Deduplication is not available in Azure for any Backup component. Every Azure Backup component supports incremental backup regardless of the target storage disk, tape, Recovery Services vault.
Incremental backup ensures that backups are storage and time efficient, by transferring only those changes made since the last backup.
Storage consumption, recovery time objective RTOand network consumption varies for each type of backup method. To keep the backup total cost of ownership TCO down, you need to understand how to choose the best backup solution. In the image, data source A is composed of 10 storage blocks A1-A10, which are backed up monthly. With Full Backupeach backup copy contains the entire data source. Full backup consumes a large amount of network bandwidth and storage, each time a backup copy is transferred.
Differential backup stores only the blocks that changed since the initial full backup, which results in a smaller amount of network and storage consumption. Differential backups don't retain redundant copies of unchanged data. However, because the data blocks that remain unchanged between subsequent backups are transferred and stored, differential backups are inefficient.
In the second month, changed blocks A2, A3, A4, and A9 are backed up. In the third month, these same blocks are backed up again, along with changed block A5.
The changed blocks continue to be backed up until the next full backup happens. Incremental Backup achieves high storage and network efficiency by storing only the blocks of data that changed since the previous backup. With incremental backup, there is no need to take regular full backups. In the example, after taking the full backup in the first month, blocks A2, A3, A4, and A9 are marked as changed, and transferred to the second month. In the third month, only changed block A5 is marked and transferred.
Moving less data saves storage and network resources, which decreases TCO.