I realized at one point that the amount of data that is truly irreplaceable to me amounts to only - 500GB. So for this important data I back up to my NAS, then from there backup to Backblaze. I also create M-Discs. Two sets, one for home and one I keep at a fiends’ place. Then because “why not” and I already had them sitting around I also backup to two sd cards and keep them on site and off site.
I also backup my other data like tv/movies/music/etc but the sheer volume of data gives me one option, that being a couple usb hard drives I back up to from my NAS.