This is how to backup node-red flow, the easy way is just menu > export and select all flow, thats it simple right

Happy Coding ..
Salam ngoprek …
Cara mudah install node-red LST di raspberry pi ikuti langkah dibawah ini
curl -sL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
sudo apt-get install -y nodejs
Mudah bukan
Happy Coding
Salam ngoprek