Restore System which folders and files

I deleted Plank and now I can't get it back via a terminal install or synaptics. This has also wrecked havick with mate tweak as now cupertino is gone. I do have a backup of my linux from 2 weeks ago. When I go to restore, I am confronted with many folders and files. Which ones do I select? How do I know? When I try to restore everything, I get this error.