Code42 Software has released CrashPlan 3.6.3 with a simplified installation process for new users thanks to the inclusion of the Java Runtime Environment (version 1.7.0_45) when installing on Mac OS X 10.7.3 Lion and later. Previously, you were prompted to install Java separately, now that Apple doesn’t include Java by default. The update also increases the Java heap space allocation to 1024 MB for better performance, ensures that network interface exclusions and wireless network exclusions are properly obeyed, provides more control over CrashPlan’s unlimited version retention, enables those who use the 448-bit encryption + password security scheme to set a challenge question and answer, and updates translations. There’s no need to download CrashPlan 3.6.3 manually, as the app should upgrade automatically in the coming days if it hasn’t already — the version number is displayed prominently in the app’s Settings > Account screen. (Free with a 30-day trial of CrashPlan’s online backup service, 50 MB, release notes)
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Another possibility, if you have another Mac, is to put CrashPlan on that, with the external drive, and back up to it all the time, just like CrashPlan Central.