I would be grateful for any help please. My 2010 MBP WIth OS mavericks suddenly got stuck today then shut down. When I started it again it showed up an OSX utilities window with options to restore from back up, reinstall OSX, get help online or repair disk using disk utility. I chose disk utility to repair the disk. When I clicked on repair disk in disk utility I got a message saying the disk can't be repaired, back up as many files as possible then reformat the disk and restore backed up files. How can I back up my files from disk utility? Grateful for any advice to recover my files and sort the problem.