I have been using CrashPlan on numerous machines running various operating systems. I heard about Backblaze from a podcast I listen too. Apparently it takes fewer resources than CrashPlan. I tried it. Worked well. But the Mac version is crippled, the total cost on all systems was no savings than with CrashPlan, and I would need CrashPlan for running on Linux.
So no compelling reason to change.