No, do an settings backup before flashing. Your settings will be recovered after without problem. You have to reinstall only plugins and addons.
More stupid questions from another newbie.
Can I update from the box, Green > Yellow > Online Black Hole Image Update? If not is there a link I have missed with instructions?
How do I back up? Is it here...Menu > Backup Menu >Blackhole Full Backup? Do I need to restore the settings after install, or just install addons and plugins?
Thanks for your help