OSX has decent backup through Time Machine. Obviously, on a consumer system it's quite possible to install unlicenced apps, but generally apps are accessed through the App Store, which only offers licenced apps. There are, according to a quick Google, Windows-based OSX system admin products for those organisations which run both species, but Apple have largely discontinued native OSX system admin products. There is a remote desktop facility, however, which works from an OSX computer to an OSX client.
Of course, if you want to be really nasty, you could configure the iMac as a Windows box.