Transfer from my cloud to new my cloud mirror

What’s the best way to transfer 1.4tb of backup data from my old 3tb mycloud to a 6th mycloud mirror? I have a gigabit router (sky q hub) and gigabit splitter hub (net gear) and cat 6 network cables. My pc is usually used via my WiFi which is average cable WiFi from sky. I’m not hugely technical to the extent where I don’t think I could sssh it but can do basic things

Hi Milese,

You can have a look at this KBA:
https://support.wdc.com/knowledgebase/answer.aspx?ID=16540