I have Netgear ReadyNAS Duo that has given us 12 years of flawless service. At some stage, when the family budget allows I will upgrade to a new one.
It was easy to setup, easy to use. I do not have it setup for internet access (it has that capability but I choose not to use it for security reasons) and I back-up onto portable HDD for off-site back-up but the two Seagate 500 gb HDD have performed reliably.