Personal information, professional details, financial documentation, and data belonging to enterprises like sensitive information about employees, no matter what the nature of your data, it is all prone to cyber attacks putting a halt to functionalities depending on that data.
Once ransomware enters a SaaS environment it will corrupt data and block access. While one may pay the ransom to get the data decrypted this does not guarantee full access to the data and leaves users vulnerable. Storing your Dropbox data in a third-party cloud like IDrive keeps it safe from intentional or unintentional data loss.