How to take Backup

[ashwin1711]

Dear sir,
             I wanted to take backup from my corrupted Ubuntu home.I
am using ubuntu as a live session user.There are some files which says
(There was an error copying the file into /media/DISK2_VOL2You are not
the owner and in the show more details this msg *Error opening file:
Permission denied*) So I could not take backup for this video files.

I request you to help me please.

Thank you in advance
-- 
ASHWIN JANGAM