Incremental scan feature in cloudscan
As far as I know this is not available in Cloud Scan. It kinda defeats the purpose of Cloud Scan and the ability to offload scans to sensors.
We also do not usually recommend incremental scanning.
Can you provided a use case?
Depending on the situation we have no problem recommending incremental scans with WebInspect. You can find additional information in the User Guide (https://www.microfocus.com/documentation/fortify-webinspect/1920/WI_Guide_19.2.0.pdf) starting on page 201.