there is no such thing as unlimited storage. I'd be wary of anything that tries to fool me with the unlimited wording. GoDaddy's hosting packages are unlimited but after 200k inodes, it's not really that unlimited, is it?

"[Some users] store multiple terabytes."

They are certainly not a replacement for S3, but could be a substitute for some use cases. Also, they can certainly change their stance at any point, but they are certainly committed to truly unlimited.

http://blog.backblaze.com/2011/02/03/backblaze-is-committed-...

http://blog.backblaze.com/2011/10/26/backblaze-2-0-unlimitin...

Unlimited storage is a farce, and places you in an antagonistic relationship with your provider:

http://blog.kozubik.com/john_kozubik/2009/11/flat-rate-stora...

... which is the last thing you want with serious backups.

From what I've seen it's not a big problem here because it's unlimited storage for one desktop. The high-end users are only able to go so high.

Backblaze doesn't know how to work through proxies. I mean, seriously.

CrashPlan seems to and it's bloody amazing in terms of features, reliability, price and tech support.. It also has unlimited storage and uploads fairly fast.