'(version-control t)     ;; Use version numbers for backups.
 '(kept-new-versions 10)  ;; Number of newest versions to keep.
 '(kept-old-versions 0)   ;; Number of oldest versions to keep.
 '(delete-old-versions t) ;; Don't ask to delete excess backup versions.
 '(backup-by-copying t)  ;; Copy all files, don't rename them.