This is my Synology gear:
At the moment I own two synologies, but I am planing to buy a third very soon.
and my backup unit is a Synology DS216+:
For Hard drives, I use Western Digital 3TB Red NAS and I have 5, 2 for each NAS and a spare in case a hard drive goes down.
Love this disks, In my 713+ NAS I have had them for 10+ years and no failures yet.
It is important that you choose the RED CAVIAR NAS as the disks will be running 24/7 if you are powering a website from your NAS.
You can also buy the NAS as a bundle (NAS and disks). In this case, make sure you buy it with the red caviar drives on it. You wont regret it!
I also have the Synology router which makes managing your network and configuring your VPN painless and easy:
Synology RT2600AC Wi-Fi AC 2600 Gigabit Router
If you decide to buy from one of these links, so will be supporting me and this blog and I thank you for that!