I bought a synology for this. I still need to add a backup plan to it though.

That's sort of how I do mine. I put all my data onto dropbox/onedrive. I've got a $100 HP USFF hooked up in my office that is a 100% online mirror for those cloud accounts, and it backs up to an 8TB external each week. I rotate that drive with a spare each month (give or take), putting the "offline" one in a firesafe. It means I have a live copy (my pc), a cloud copy (OD/DB), a second hot copy (USFF PC), a near-line backup no more than 7 days old that isn't "live" and a cold storage copy that is no more than a month old (aka less than Apple's deleted-pictures and Dropbox's previous version storage time). It cost me two external drives and the mini-pc. And if all those fail I'll probably be roaming the radioactive wasteland looking for food and losing that data won't matter.

Oh, and that little box also runs a small FTP server and my Torrents for my Linux distro collection.

I use OpenMediaVault for my NAS

But if you don't want to be the IT of your family, I'd just go with an easy solution like WDs my cloud or one drive