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Protection Plan enablement
A Cloud Snapshot Manager protection plan enables the selection of resources that you want to protect and the assignment of a specific protection policy for those resources. You can disable or edit a defined protection plan at any time.
Application consistent snapshots
Cloud Snapshot Manager enables you to take application consistent snapshots by providing options to run Volume Shadow Copy Service (VSS) snapshots and custom scripts.
Application consistent backup for GCP Linux VMs
To take an application consistent snapshot in your GCP environment, first prepare your guest environment by deploying custom pre and post-scripts files. These files are shell script files that run automatically before and after the snapshot operation.

Application consistent backup for GCP Linux VMs

To take an application consistent snapshot in your GCP environment, first prepare your guest environment by deploying custom pre and post-scripts files. These files are shell script files that run automatically before and after the snapshot operation.

Use the pre and post-scripts for operations like:

Stop applications or operating system processes running on the VM that write data to the disk.
Flush the buffers. You can use whichever tool is available for your application.

As per the GCP guidelines, all these script files must be copied to all Linux VMs that you want to protect with application consistency.

NOTE: Application consistency will be guaranteed by the behavior of your pre and post-custom scripts and not by the snapshot operation itself.