You can disable backups of helm charts by using the bK8sHelmChartBackup entity setting.
Procedure
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From the navigation pane, go to Manage > System. 
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Click the Settings tile. The Settings page appears. 
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Click Add, and then select Entity settings. The Add entity settings dialog box appears. 
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In the Name box, enter bK8sHelmChartBackup. 
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From the Entity list, select the Kubernetes access node. 
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In the Value box, enter false. 
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In the Comment box, enter an explanation for the change. 
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Click Save.