Critical error after Update

Hi, Today i made several updates of my clients, aprox. 45 Sites.

Not all of them but several give a critical error, after deleting BackWPup the error is gone, at this moment 5 sites of 13….

Impossible to compare Hosting or Conflicts with other Plugins, Disable Plugins and testing out (45 site with a total of maybee 470-520 Plugins is impossible to test)