Human error is one of the most common causes of data loss or breaches. In the ITIC report, they state that 64 % of downtime incidents have their roots in human errors.
If you think that in SaaS environments all your data is safe, you need to think once again. All SaaS providers, including Microsoft, follow the shared responsibility model, which states that the service provider is responsible for the accessibility of its infrastructure and services, while a user is responsible for their data availability, including backup and disaster recovery.