Within this rule you should have at least 3 backup copies in at leat 2 different storage destinations, one of which is offsite. This backup rule esures that you can restore your data in diferent disaster scenarios, for example, if there is an infrastructure outage.<p>Here is apost where you can find out more about the 3-2-1 backup rule and its morden alternatives - the 4-3-2 and 3-2-1-1 backup strategies: <a href="https://xopero.com/blog/en/the-evolution-of-data-backup-is-the-3-2-1-backup-rule-a-thing-of-the-past/" rel="nofollow">https://xopero.com/blog/en/the-evolution-of-data-backup-is-t...</a>