A company I previously worked at (self-hosted) all production servers were RAID 5, plus continual cloud backups, with nightly backups that rotated weekly and mo

A company I previously worked at (self-hosted) all production servers were RAID 5, plus continual cloud backups, with nightly backups that rotated weekly and monthly backups that were shipped out of state and stored in a disaster recovery facility in the event of a total catastrophe (earthquake, hurricane, etc). The off-site backup storage was required by several of our largest customers due to the critical nature of our software.