How do I back up my 'The World Ends With You : Solo Remix' save file?

[Shiranui45]

And yes, I have already Googled it. I found one result that might be helpful, but my [language removed] country's blocking system doesn't let me access said site (which is Reddit). I can easily use an unblocker, but unfortunately, I am on a trip, and that would not be enough since the Internet wi-fis here are so damn slow.

I'm trying to reset my phone, but I don't want to lose my save file. Help?

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