The 3-2-1 system refers to a highly secure redundant backup system in case one of the systems fails, and you don’t want to lose a single day of work.
For example, if ransomware infects company computers, it is likely that the backup will be infected as well, due to how advanced current ransomware malware systems are.
Likewise, the cloud service is not infallible and may also have a failure or be unavailable at certain times, and the backup may not be performed.
The scheme is actually simple. What you need to do is the following:
- 3 backups in total
- 2 different supports where we have these backups
- 1 external or offline backup, physically away from the location