Brian from Backblaze posted a graph for 2018 showing how much data customers were backing up. More than 50% of customers were backing up less than 300GB. They

Brian from Backblaze posted a graph for 2018 showing how much data customers were backing up. More than 50% of customers were backing up less than 300GB. They're paying $6/mo for backups that would cost only $1.50/mo on B2. The graph did show one customer backing up over 400TB, which I would consider abusive, but as long as it's just one / a few customers doing crazy shit like this, it's not worth changing their unlimited backup offer to an unlimited* offer, and having fine print saying there actually are limits. If it were me, I'd continue offering the $6/mo unlimited plan, throttle upload bandwidth for personal backups larger than a TB, and offer a high-performance option for $6/mo/TB with no throttle that also supports Linux, network drives, and anything else you want to backup. That's still a 20% premium over B2, and they have control over the client behavior which is also an advantage.