phone continuously restarts, somehow can back up my data?

Hello, I have a problem with the phone. I have a Samsung S3. Two days ago he suddenly began to restart. The phone must be booted after an hour, but now pop up messages android.process.media D.str.Touchwiz stopped and paused for a moment and turned off. Is there any way to zístkat phone data before the factory reset? The boot menu option backup is not, nor is it to me unable to connect to the PC.
Thank you very much for your advice

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