Microsoft Azure Administrator Associate AZ-104 Practice Question
A company needs to back up its Azure Virtual Machines running Windows Server without shutting them down. The backups must be application-consistent to ensure that applications like SQL Server can be restored without data loss. Which technology does Azure Backup use by default to achieve this on running Windows VMs?
The correct answer is Volume Shadow Copy Service (VSS). Azure Backup uses VSS on running Windows VMs to create application-consistent snapshots. It coordinates with VSS-aware applications to quiesce I/O operations and flush in-memory data to disk before the snapshot is taken, ensuring the application is in a consistent state. Azure Site Recovery is used for disaster recovery and replication, not for creating backup snapshots. The Azure VM Agent is required to coordinate the backup process but is not the technology that ensures application consistency itself. File-system consistent snapshots are a different level of consistency and are typically used as a fallback or for Linux VMs by default.
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What is Volume Shadow Copy Service (VSS) and how does it ensure application-consistent backups?
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What is the role of the Azure VM Agent in the Azure Backup process?
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How does application-consistent backup differ from file-system consistent backup?
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Microsoft Azure Administrator Associate AZ-104
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