How to backup & access to "My Cloud EX2 Ultra" from the internet

I want to access to the My cloud drive (My Cloud EX2 Ultra) via the internet for backing up computers or for accessing data stored on the drive but not through the browser (I prefer to map a shared drive). I have not found any solution or a software to do so, I would be more then happy if anyone has step by step tutorial.
B.t.w - Does my drive come in OS 5?
Should I need to upgrade?
(I posted this question in the wrong forum- so I copied here, sorry)
Thanks in advanced

You can try the GoodSync for WD software with the GoodSync Connect account. It’s available for both OS3 & OS5:

There are also 3rd party software such as Resilio that you can check out.