The floor on keeping HDDs spinning is about $4/spindle-month (assuming $0.60/KWh total cost in a data center) and 150 drives probably eats more power than the r

The floor on keeping HDDs spinning is about $4/spindle-month (assuming $0.60/KWh total cost in a data center) and 150 drives probably eats more power than the rest of the enclosure and a rack switch, so call it $6/spindle, and Backblaze aims at $30/TB upfront cost and seems to have only >=4TB spindles so there's plenty of room for unlimited plan users to keep making them money at $6/month. I, as a fairly nerdy person, only need to back up a hair under 2TB at this point, and I assume I'm past the 90th percentile of bb's unlimited customer distribution and they would still make money off of me if I kept 2TB there >15 months on the unlimited plan ($30 / ($5 - ($6/spindle * spindle/4TB * 2TB) month). I think their best advertising for B2 is the quarterly hard disk stats, it's a shame they made this mistake with the fb tracker; I can't store data in my garage as cheaply as they do. ~100W continuous for a box with drives at $0.30/KWh (CA PG&E) is $20/month. I'm jumping through the hoop of s3backer to turn B2 into a vdev for a zpool with encrypted datasets; I'll have to try something similar on rsync.net with sshfs.