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In order to do incremental backup You need to assign a VM to the policy with incremental schedule. Creating of schedules and policies is described in vProtect documentation:
https://storware.gitbook.io/storware-vprotect/administration/virtual-environments/untitled/untitled-1backup-slas/schedules
https://storware.gitbook.io/storware-vprotect/administration/virtual-environments/untitledbackup-slas/policies
Once You have the policy assigned, please go to Virtual Environments → Instances and select VM You wish to backup. In right corner click “Backup” button
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