It’s one thing to backup data, and another to verify the backup was a success, but you also should test restoring backup data so you can “fix the issues before data gremlins such as hard drive failures, natural disasters, or ransomware delete your” data and intellectual property according to the article “How to review and test backup procedures to ensure data restoration” which was published on CSOonline on March 29, 2016 supporting the idea that:

By properly testing and ensuring that your backups are existent and recoverable when data disaster rears its gruesome head, you can rest in the knowledge that information security incidents that could rob your data and interrupt its use will not also leave you without your data altogether.

If you follow verify backup and test data restoration you are more likely to be able to restore data without paying ransoms!