I feel for these guys. Ransomware is some volatile stuff.
One of my office PCs got infected with ransomware last year. It started systematically replacing each of the data files on our network hard drive with locked versions.
Fortunately we have multiple redundant backups of everything. Once we caught it, it was a relatively simple matter of reformatting the infected PC and restoring all of the data files from backups. Of course, I have a relatively small network with only a half dozen PCs.
I would have shut my doors and gone out of business before I would have paid the SOBs a penny in blackmail money.