This is the series of How to build / install / create an Elrond Node, either on Mainnet, Testnet or Devnet.
Part 10 – Install a Backup Node or Node Redundancy

INSTRUCTIONS:

I. INSTALL A BACKUP ELROND NODE / NODE REDUNDANCY – MAINNET, TESTNET & DEVNET

1. Install the Server
2. Make the server secure
3. Install the node on it
4. use the .pem file from the main Node
5. do the settings in prefs.toml file for the RedundancyLevel = 1 (~/elrond-nodes/node-0/config/prefs.toml)
6. start the node
7. check the node in Elrond Explorer

Elrond Validators Docs – directions: https://docs.elrond.com/validators/sy