A folkie friend and author had his main computer connected up to back up drives. Then he inadvertantly opened a 'financial statement' attached to an email. Seemed OK - he was expecting one from his publisher. But this carried a ransomware payload. Not only were his main files encrypted but ALSO all of his backups on the connected drives - these included scripts for his books and irreplaceable family photos. He lost the lot.

And dont forget that a few years ago soome idiot scammer sent a ransomeware virus around that had a bug in the code. This meant that encrypted files couldn't be decrypted at all. There's no honour amongst thieves.