back up and restore on moodle

hi i am using moodle 2.7+

I backuped the moodle 2.7+ file and i got a 60kb (an.mbz) file.i restored that file on another moodle.All are successfull.i clicked on that continue button got a blank page.Why.I got the course name on my course .But when i clicked on that course name a blank page.Also my db size is 12MB.But this file is just 60 kb.How can be it possible.Did i any mistakes.