I would very much appreciate it if you could add a confirmation when deleting condition groups. Today I accidentally deleted one very important condition group because a button was accidentally clicked ⌫ or ⌦ (unfortunately I don't remember which one)
that was probably cmd + ⌫
I don't like a confirmation, but I'll add undo support for this!
BTT keeps various auto backups, maybe you can restore your group from one (Help => Restore Settings From Backup)
Can you also add support for any deletion - like deletion of trigger, action etc.? I've just deleted a trigger by mistake (pressing the Bin/Trash icon), and the backup you mentioned is not fresh enough to restore it.