I wish Backblaze supported Linux. On Mac/Windows it's impossible to beat Backblaze IMO. It saved my ass against disk failure twice already.
Many times I've cursed at Carbonite's app for doing nothing when I want to back up, and popping up annoying when I don't.
I use B2/restic and only selectively backup things that are either irreplaceable or I'm willing to pay for. It costs me around 1 USD/month, which is only ~200GB. I have a lot more data than that on my NAS!