This is a living document and will be updated as and when required.
Q1: Why do we keep the backup?
A1: We keep the backup because we need to keep the record of any changes done in the router configuration file. This is because due to any untoward incident if the hardware or the software or both get damaged then the administrator can easily retrieve the configuration. Otherwise the person would require to reconstruct a complex router configuration file from memory (memory type). When you have the backup of the last working configuration file, you can usually get a router working again within minutes of fixing any (hardware/software or both) problems.
