How should I set up my External drives

I have a MyCloud, Easystore portable and My Passport Wireless Pro.
I need to know in what order i should set these up. Since I don’t have enough storage on computer to store all my pics and documents, I need to use 1 as main storage drive to, then one of the drives for back up or sync and lastly extra just in case.
Any advice would be greatly appreciated.

Hi,

To set up the WD My Cloud device, follow: https://support-en.wd.com/app/answers/detail/a_id/6857

Now, map the network drive: https://support-en.wd.com/app/answers/detail/a_id/25436

For, NAS to USB Backup: https://support-en.wd.com/app/answers/detail/a_id/20227