And by refusing to offer a Linux version of their backup tool, which would be a totally logical thing to do, given their apparent focus on tech-savvy customers (just look at how and where they advertise). Tech-savvy people use Linux on their machines far more often than the average customer, So supporting it would be a no-brainer.

But people also tend to use Linux on machines with lots of disk space, like home servers. Wouldn't it be nice if those could backup their 30TB locally attached storage with the unlimited plan? Nope, not for Backblaze, which is why they shy away from Linux and try to get Linux users to buy their pay-per-Gigabyte plan (for which they miraculously are able to provide Linux support...).

Indeed - having a huge NAS that all of your home computers back up to, which then backs up to Backblaze would be an obvious workaround for buying multiple licenses ... although why go to that trouble when it's $6 a month per computer? That's one fancy coffee.

"Your external hard drives need to be connected to your computer and scanned by Backblaze at least once every 30 days in order to keep them backed up"

-- Backblaze

In other words - instead of backing up your data - backblaze may delete it unless you read and understand their fine print.

I'd never deal with provider sneaking in such a nonsense behind loud claims of "unlimited anything"

They email you repeatedly if they haven't seen your drive for at least 14 days warning of this.