This sounds like something that was mostly missed by the comments here — does that mean that people who only utilised their peer-to-peer backup system need to find another solution too, because their software needs to phone home to work?
Relying on user accounts and "backup codes" [1] stored on CrashPlan's servers sounds like a scary additional point of failure.
Well, one more thing to add to my list of criteria for backup software: that it'll keep running, for the most part, without having to log into an account somewhere.
[1] https://support.crashplan.com/Backup/Backing_Up_To_A_Friends...
In combination with file watching and storage of multiple versions per file this makes a pretty unique feature set which makes it hard for me to find a replacement.
They stated a few times that the free version will also only work until that deadline. I assume the client is not going to work anymore after that.
I'd prefer they released an offline (home network) version which I would gladly pay for.