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2.4.2. Virtual Machines - Azure Backup & Azure Site Recovery & Snapshots.md

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Backups

Azure Backup

  • Managed service for back-ups.
  • Use for production workloads.
  • Creates recovery points that are stored in geo-redundant recovery vaults.
    • Allows you to restore whole VM or specific files later on.

Setting up

  1. Create a recovery services vault
    • It stores your back-ups and recovery points.
    • Choose between geo-redundant (default) or locally redundant.
  2. Define the backup in vault.
    • Snapshots (recovery points) are stored in the vault.
      • You can restore VM from any recovery point.
    • Create new back-up
      • Set backup goal with
        • Source: From where (Azure/on-premises/Azure Stack)
        • Object: What e.g. VM, SQL (depended on source)
        • 💡 In Site recovery the action is called protection goal
      • Configure back-up policy:
        • Frequency (retention range): How often? Ex. once a day, weekly, yearly etc.
        • When exactly? (ex. 11:00 AM Sunday)
    • You can back-up directly with "Back-up Now"
  3. Back-up virtual machine
    • Azure VM Agent must be installed on VM, they're already installed for VMs from gallery.
    • Backing up VMs is a within region.
      • ❗ You cannot back up VMs from one region to a Recovery Services vault in another region.
      • ❗ For every Azure region that has VMs to be backed up, at least one Recovery Services vault must exist in that region.
    • For on-premises, you need to install VM agent

Restoring

  1. You can choose to restore only files.
    • Restore types: Three Ways to Restore Azure IaaS VMs:
      1. Create a virtual machine
        • Basic settings such as VNet,subnet and storage account.
        • ❗ Does not support advanced settings such as e.g. VMs under load balancer, multiple reserved IPs or multiple NICs.
      2. Restore disks
        • Copies VHDs into a storage account you specify.
        • You can then create a new VM using these disks or attach existing VM to the disk disk.
      3. Direct File Recovery
        • Select recovery point -> Download script to mount VM disks so you can browse them -> Once you restore files, unmount the drives.
  2. Create a new VM
  3. Create a new store disk (copies VHDs).
  4. Replace existing VM
    • ❗ Only supported for unencrypted managed VMs from marketplace).

Azure Site Recovery

  • Protects from a major disaster scenario when a whole region experiences an outage.
    • E.g. due to major natural disaster or widespread service interruption.
  • You can replicate to an Azure region of your choice.
  • You can set up easily on Portal => VM => Disaster recovery with target region.
  • Explained more here.

Snapshots

  • Read only-copies of managed disks.
  • Provide a quick and simple option for backing up VMs.
  • Snapshot for consistency requires you to stop VM, Azure backup handles it via en extension
  • Can be used to rebuild VM / create new managed disks as they exist independently.
  • Billed based on the used portion of the disk (not whole disk capacity).