Ransomware and Veeam operators tell BleepingComputer how they target victim’s backups. DoppelPaymer and Maze Ransomeware operators say cloud backups can be a good option to protect against ransomware. Backups are one the most important defense against ransomware, but if not configured properly, attackers will use it against you. Backups first use your cloud backups to steal your data, but do not always always good configured, offline backups often outdated. Backup software should be used to protect your network against attacks, but not 100% effective.
Source: https://www.bleepingcomputer.com/news/security/ransomware-attackers-use-your-cloud-backups-against-you/