Crashplan stops with serving the consumer market. Current subscribers are supported for another 14 months. Up til now they had (in my view) the best offer with their Family Plan: unlimited backup for multiple computers for $14/month, with support for Windows, Mac and Linux.
Crashplan proposes Carbonite, but it doesn't offer Linux support and has no family plan.
At the moment I'm backing up three computers. What good alternatives are there for backing up securely online? I do have access to a 1TB online archive (Owncloud based).