OK, I know what that is now. It must be a Clonezilla backup; it follows the default format for how Clonezilla keeps a backup image. For Pete's sake, don't start reinstalling, there is nothing broken here.
Daniel~, just move that directory to another place - any other place will do, just get it out of anything under /boot where you can find it if you need it. Your /home/Daniel/<name_here> directory is a good place. You'll have to do it as root. How you managed to save it in that particular location is beyond me, lolz...
It's 8 months old anyhow; you should really make another one after this is straightened out.
EDIT: Daniel, just delete it. The backup image you have in the other location is more recent, so this one is obsolete:
Code:
sudo rm -R /boot/EFI/2017-06-03-02-img