Never done it before, but I think you can create a dump of your whole database.
Click your database, then click Export, and then click Go.
PS: You will find on the same page (Export) at the bottom where the file will be saved.
PS2: Like I have said, I've never done this before, I've just tested myself, but I'm not exactly sure still, maybe wait for someone to confirm my post.
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Oh, nevermind, you're using Linux; so things might be a bit different, sorry I don't know then.
I have never used Linux.