It is a Java application in name only. It ships with its own Java VM that it runs on. If Doug finds himself restoring on some future version of Windows that that copy of the Java VM doesn't run on, then the fact that it is a Java app may well not help him much.

Sure, you might get it to run on some other version of the Java VM. But you might not.

It isn't something that I'd want to rely on, which is why I'm ditching CrashPlan for all my back ups, even the local ones.