There are programs that will create images of the system disk with Windows running but these need to lock the drive to do so. Why? No changes are allowed to take place will making an exact duplicate. Otherwise, it's not exact. Acronis True Image, which I use, will do that. It can do scheduled backup images or amend them as incremental or differential types but it's going to lock the drive. As for just updating like a sync process, that won't work after new software installations as there are registry entries that need to be made. I'm sure you've considered other backup options so I won't offer alternatives as you appear to have a specific solution in mind. I doubt you'll find such a package but good luck anyway.