Pre-Freeze and Post-Thaw Scripts

If you back up or replicate VMs running applications that do not support Microsoft VSS, you can instruct Veeam Backup & Replication to run custom scripts for VMs. For example, the pre-freeze script may quiesce the file system and application data on the VM guest OS to bring the VM to a consistent state before Veeam Backup & Replication triggers a VM snapshot. After the VM snapshot is created, the post-thaw script may bring the VM and applications to their initial state.

You can use pre-freeze and post-thaw scripts for the following types of jobs:

  • Backup job
  • Replication job
  • VM copy job

Scripts must be created beforehand. You must specify paths to them in the job settings. Script execution settings can be configured per VM or per container, depending on the objects included in the job.

When the job starts, Veeam Backup & Replication uploads scripts to the VM guest OS and executes them under the account specified in the Guest OS credentials section of the job settings.

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