Code42 recently updated CrashPlan to version 4.3.0. A small number of users have reported that CrashPlan is unable to connect to the backup engine after this automatic upgrade.
If you are seeing the message “Unable to connect to the backup engine, retry?” on the splash screen of the CrashPlan app installed on your computer, please try following the instructions in the article below:
If the instructions in the article above do not help, please try doing a complete uninstall and reinstall. We have an article with instructions here:
Performing a complete uninstall removes the CrashPlan identity file, meaning there is no trace of the previous installation. If you were previously backing this computer up using CrashPlan, and are able to open the app after doing a complete uninstall and reinstall, please follow the instructions in this article to adopt your previous computer:
If you are still unable to open the app after doing a complete uninstall and reinstall, please open a support ticket — from this page or by sending an email to firstname.lastname@example.org — and send us the following information: