Backdoor
An unauthorized way to access a computer system that bypasses the system’s security measures.
Backup
A copy of a system’s data. Having a backup means you can restore your data if it’s lost or stolen. In the IT world, i is important to remember: 2=1 and 1=0. This means that of you have two backups (one could be lost, damaged or compromised) and thus you really only have one backup. […]