How can i backup files in Disk utilities, files from HD to exHD?

I'm having some issue with my Macbook Pro, it turns to be slow and lag. I would like to backup my data and format it, but i could log into it.
i can only enter Mac OS X Utilities.

That's a signal that the hard disk is damaged. On OS X Utilities, you can try to make a clone of the hard disk with Disk Utility:
Open Disk Utility, select Macintosh HD in the sidebar and go to Restore tab.
Drag an external disk to Destination box and press Restore.
If it doesn't work, you can use Target Disk Mode to connect your Mac to another one using a FireWire cable and transfer all your files. If not, use DiskWarrior to recover data. Finally, take the Mac to an Apple Store

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