Pre-Freeze and Post-Thaw Scripts

If you plan to back up VMs running applications that do not support VSS, you can specify what scripts Veeam Backup & Replication must use to quiesce the VM. The pre-freeze script quiesces the VM file system and application data 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 brings the VM and applications to their initial state.

To specify pre-freeze and post-thaw scripts for the job:

1. At the Guest Processing step, click Applications.
2. In the displayed list, select the VM and click Edit.
3. Click the Scripts tab.
4. In the Script processing mode section, specify the scenario for script execution:

• Select Require successful script execution if you want Veeam Backup & Replication to stop the backup process if the script fails.
• Select Ignore script execution failures if you want to continue the backup process, even if script errors occur.
• Select Disable script execution if you do not want to run scripts for the VM.

5. In the Windows scripts section, specify paths to pre-freeze and post-thaw scripts for Microsoft Windows VMs. For the list of supported script formats, see Pre-Freeze and Post-Thaw Scripts.
6. In the Linux scripts section, specify paths to pre-freeze and post-thaw scripts for Linux VMs. For the list of supported script formats, see Pre-Freeze and Post-Thaw Scripts.

If you have a VM container with Microsoft Windows and Linux VMs added to the job, you can select to execute both Microsoft Windows and Linux scripts for the VM container. When the job starts, Veeam Backup & Replication will automatically determine what OS type is installed on the VM and use the correct scripts to quiesce this VM.