Karen's Replicator meets most of your requirements, and it is free.

It requires a one-time initial setup so it knows what to back up and where to put it, but after that, it is just click the icon, then click on the job name and it's off and running.

The interface for the setup is quite powerful.

It will not back up Windows system files that are currently in use, so it won't create an image that could completely restore a computer after a hard drive crash.

tanstaafl.