«Backup is optional, not a must!»
In principle, this statement is correct. It is like mountaineering: A free climber does not need a backup. But if a free climber is surprised by rain or snowfall on the rock face, it quickly becomes life-threatening.
Unfortunately, in the modern, fully networked IT world, changes in a threat situation cannot be completely controlled either.
Therefore, it is a must for professional IT that unalterable backups are made just in case.
However, it’s not just about external threats; faulty manipulations by one’s own employees can also quickly lead to a total breakdown of business operations.