The smart ransom people wait after infection to ensure all your backups are infected.

But ,then ,I'd suggest having at least off line data backups. So if the first one & Bios gets corrupted, then you can get a new MB( lot cheaper than ransomware prices, and by doing this, ransomware man is losing out on power). But best defence against ransomware man is to bin those e mails from "superstore.com" offering "free " gifts, and treat any other unsolicited e mail as just that- a means to infect your PC. Then, there's staying away from sites that look dodgy.

 

Apparently, not enough, any infection picked up from a poisoned advert on a legit site could be used to then download the ransomware; I am not sure if it has happened yet, but it will come. UEFI boot was supposed to stop this happening, but the blackhats had a workaround out almost before UEFI enabled motherboards hit the shelves.