If you don't want to bother with making a boot USB or DVD to do Clonezilla, DriveImage XML is also free for private use and can hot image your drive while you are still booted and using it. UI is a bit clunky, but not too difficult.

Our household is exclusively Mac these days, so I use Carbon Copy Cloner, which has the advantage that it can automatically clone the hidden rescue partition that most of the others miss.