Systemback
This tool can do various things. You can define system-restore points, You can also use it to create a “live-system” copy of your system that you can copy onto a DVD or USB-stick. I have a vague recollection of reading somewhere that it does not backup your “home” files i.e. you might have to use the “ubuntu-mate” backup tool to backup your “home” and systemback to backup your system.
There was a good write-up in Linuxwelt 6/2015, pages 20-21 for those who can read German. Here are two links to English-language info concerning the tool.
Link B: http://www.unixmen.com/systemback-restore-linux-system-previous-state/
I have not used it myself. When I have a serious problem with my rig I prefer doing a fresh install.
Be careful…