How to back up files frtom My Book Duo

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1

I have My Book Duo, i store movie file . I want to back up my MyBookDuo to another drive (external).
Please tell me how to backup.

2

@myothant Have you looked at the User Manual?

https://www.wd.com/content/dam/wdc/website/downloadable_assets/eng/user_manual/4779-705166.pdf