Snapshot managed backup won't run - ever!

Hi, I have an artist's website that showcases her work. The site itself is very simple but for some reason, the managed backup function in snapshot pro, just will not run. I have re-installed wordpress & all the plugins but to no avail.
As shown in the attached screen shot, it just says at the top of the screen 'Automatic backup currently running'.
Please can you help me out?