Watched the piece about this on BBC Breakfast this morning... The closing comment by an affected (home) user was... "make sure your protection is up-to-date". I was disappointed that at no point did anyone mention backing-up personal data just in case such things happen and all your personal docs are encrypted.
Reinstalling Windows (presumably the OS of choice) and copying data from a backup is a lot cheaper than shelling-out to Ransomware chumps.
I appreciate that maybe your average Home User might not know how to re-install Windows, but don't new computers at least come with a small leaflet detailing how to restore a computer/laptop to factory settings via a hidden Restore partition?