backblaze.bzpkg was not removed during uninstall
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My computer got the 'Safety Freeze' issue because I had copied my drive over from my old Mac Pro and I booted it up to erase it.
So backblaze (rightfully) freezes the data because it sees the same computer name/drive name/whatever.
Here's the fix on that:
But in my case, I got a message about backblaze.bzpkg not being removed.
Simple fix: just download the .dmg from the help article above and run the uninstaller from there vs. from the icon on the menu bar.
What bugs me: seems like there should be a simple way to say 'resume backups' in this case.