But there's a story that goes back to the 70's. One of my former co-workers used to talk about the best way to damage an enterprise. He said to cause the organization's backups to be corrupted. Then when all their backups had been corrupted, delete the live versions and they wouldn't be able to restore.
He was way ahead of his time.
ZDNet had an article about ransomware attacks corrupting/encrypting backups because they were online when the attack occurred.
Don't forget my admonition.
Now I'm going to add one.
Take the backup copies offlineDo it. Do it again. Worry about it.
I use Macrium Reflect and then keep the USB drive in my trunk.
And as usual I use belt, suspenders, and raincoat. Both Crashplan and Zoolz have built-in ransomeware protection.
I still worry.