According to Darknet Diaries there are gangs that focus on backup server first, because with backups in place ransomware is not as effective. There are examples

According to Darknet Diaries there are gangs that focus on backup server first, because with backups in place ransomware is not as effective. There are examples of backup software companies being compromised to get to their clients. This is for attacks against bug companies. But maybe it's just a matter of time before "ordinary" ransomware is updated with destroy-backups function.