Downgrading / reverting to a lower version gives general procedures, however it can require manual work to downgrade databases, depending on how much change has happened since the old beta version. It’s much simpler if one is willing to export backup jobs then start over, but sometimes people value their old versions. Your case is different because you had a broken backup to start with, and possibly the crash made it worse. Beyond the documented server database downgrade, it looks like the job database format has changed too.
I’m going to look into downgrading procedures sometime, meanwhile you can consider the direction you like. Maybe you’ll have a better idea where things landed after all the action finishes. Concerning the right thing, canary is sometimes better (due to fixes) than beta, sometimes worse (new bugs), and always less “known”.