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Refer to my XA Ultra. I planned to reset to factory settings and I want to back up my phone data but I do not own a PC or laptop. Please advise any other method?
You can find more info here http://support.sonymobile.com/global-en/xperiaxa/userguide/backing-up-and-restoring-content-on-a-dev...
Also make sure you transfer all your media files (pictures, movies, videos) to your sd card before reset.