Here's the histogram from their AMA: https://i.imgur.com/iVEuwUT.jpg

About a third of the users are under 100GB.

Another third is under 500GB.

13% from 500GB to 1TB.

9% from 1TB to 2TB.

8% from 2TB to 5TB.

5% above that.

And they cited raw costs of over $3.50 per TB. But of course that's with real datacenters and non-shoddy equipment.

Don't forget the vast amount of notebooks with SSDs that have less than 1TB storage to begin with.

Backblaze deduplicates data right? So it doesn’t really cost them anything to back up your steam games.

They can't deduplicate properly encrypted data, that will have to happen client-side. So while they can deduplicate your data (if you have a copy of a picture in multiple places or maybe even a game installed on multiple machines), it won't work across users.

In that case I’d also expect them to skip uploading the data, but everything is uploaded.

they'd probably charge you the same anyway, even if THEY get it at basically free ;)