I use cloud storage for most of my documents. My NAS runs a daily job to pull down any updates. Once a month it encrypts everything and sends it up to B2. I definitely have room for improvement there and need to look at moving to daily differentials or incrementals. I'm also probably moving to glacier, unless B2 comes up with something comparable.
The only thing I do locally is video editing, because pushing lots of 4K over my 300/300 FIOS connection is an exercise in extreme patience. But once I'm done, I back that up to the NAS. From there a separate job encrypts and backs it up to B2.
So if my Windows drive got obliterated today, I wouldn't lose anything worth saving. I'd just have to deal with a reinstall.
I personally have had good luck with NOS drives from eBay. Not going to spam the seller here and it's possible that I've just received wiped drives that went through a SMART reset. But they show zero signs of physical wear, even inside the screw holes.
My budget allows for new now so I no longer have to rely on discount NOS. But it's an option for someone on an extreme budget.
You can throw them in an off-the-shelf NAS, or build your own using something like Unraid or TrueNAS. I use TrueNAS and it works great for me but the learning curve may be steep for some. Both TrueNAS and Unraid work well on old hardware so if you've got that old first-gen i3 from 15 years ago, it will be more than enough horsepower to run the NAS.