Step 4: Check Azure Backup VM Extension health. This is how essentially all modern backup software functions. The quiesced snapshot for this VM doesn't work from vSphere level (you can check it by trying to capture quiesced snapshot manually from vSphere client), which results in automatic failover to non-quiesced snapshot during backup. I am trying to understand the difference between File system consistent and crash consistent backups provided by Azure. The majority of the information that I find is from this link. Azure Backup uses the VM Snapshot Extension to take an application consistent backup of the Azure virtual machine. For successful application consistent VM snapshots, the following need to happen: Backup snapshot is triggered with app-consistent option enabled. To trigger VSS freeze, Veeam Backup & Replication goes as a VSS requestor and requests Microsoft VSS to create a consistent and reliable state of application data before taking a VM snapshot or a Hyper-V shadow copy of the VM. In some cases, the VMware VSS writer does not create application consistent snapshots on some virtual machines (VM). A crash-consistent backup set means the backup captured all of the virtual machine's data at exactly the same time. Successful application consistent VMware backup causes significant interruption to the VM guest during snapshot operations and/or contains inconsistent application data. The VM could not be quiesced prior to snapshot creation and this backup will not be used as a base for subsequent CBT backups if successful. Failed to create the virtual machine snapshot. Azure Backup will install the extension as part of the first scheduled backup triggered after enabling backup. Then the VSS provider coordinates with VSS-aware applications to freeze all I/O operations at a specific point in time. Actually Altaro will still take regular incremental backups of a non-windows VM, however as Keith correctly stated it will show up as non-application consistent with that warning by default. This is normal behaviour for a VM running an OS that is not VSS aware. The CVM reaches out to the NGT service running on the VM via TCP/IP to signal that VSS snapshot is needed. The crash consistent backup method has the advantage of completing quickly without interrupting the virtual machine; however, it is not appropriate for virtual machines that need an application consistent backup. Crash-consistent backups are fine and work well for the most part for nondatabase applications. Running a crash consistent backup ensures that virtual machines are backed up, even when VSS cannot be engaged successfully. As a result, the backed up data may not be in an application-consistent state. Backup of virtual machines finishes with warnings: Creating a crash-consistent snapshot of virtual machine 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX' because the creation of its application-consistent snapshot has failed. I see Application consistent backup is to ensure that all memory data and pending I/O are accounted for perhaps by using a quiescing process so proper snapshot can be taken. Verify Prerequisites: Complete the following prerequisites to create application consistent snapshots: Latest VMware tools must be installed in the VM.
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