I solved it by following all of the uninstall steps and then reinstalling CloudBerry.

2 year old issue... and I just hit it today with the latest and greatest version.

I discovered that all my backup plans were missing again, tried to make a test plan, and when clicking 'done' it went and hung on that "exec edit plan command" popup. Killed the app, tried again, same thing.

Backup version?

3.0.2.122

You’ll need to open a support case and submit the logs for analysis. https://kb.msp360.com/backup-mac-linux/obtaining-logs-on-macos&linux