What are the differences between Local scan, OnDemand scan and InDepth scan? In my case, Local scanned 178,876 files in 24 min. OnDemand scanned 691,026 files in 71 min. InDepth scanned 679,729 files in 68 min. I don't see much difference between OnDemand and InDepth. And what's the Local...just a quick light weight scan?