What is a stand-by Node or backup Node?
A standby node is a type of node, which exists mainly to replace a permanent node when it fails. That is why; it is also termed as a back-up Node. It does not contain any data or performs any computations. However, when it takes the place of a failed node, it contains all its projects and performs all computations of the replaced node.
What is the Purpose of the Stand-by Node or Backup?
Stand-by Node keeps a check on traffic inflow so that it can automatically take over when the active node fails. Thus, it makes the Blockchain Network more robust and stable. If any Master node / Validators nodes resign or go out of the network, then Standby Node becomes a master node and starts participating to write the Network Transaction.
To know the differences between a master node and a stand-by node and step-by-step guide to Setup a Stand-by Node with XinFin MainNet in 8 Simple Steps. Read the article: https://medium.com/xinfin/setup-stand-by-node-or-backup-node-on-xinfin-mainnet-4e83e5f01c8f