If the ransomware has no vulns itself, this is going to be a hit to economy, either by paying the ransom (it's already hit some major companies) or the losses produced by it.
I've rarely worked at a place that didn't shadow copy your user directory to a network location. The only thing that SHOULD be lost is whatever hadn't been saved when they were ransomwared.
The company should be able to pull a backups from the last file change prior to that event.
If the ransomware has no vulns itself, this is going to be a hit to economy, either by paying the ransom (it's already hit some major companies) or the losses produced by it.