You can create a subclient for Lustre to specify the content to back up.
From the navigation pane, go to Protect > File servers.
The File servers page appears.
Click the file server.
The file server page appears.
In the Subclients area, click Add subclient.
The Add subclient dialog box appears.
In the Name box, enter a name for the subclient.
From the Backup plan list, select the server plan to use for the subclient.
For Content, specify the content to include in this subclient.