Yeah, ransom ware /crypto virus is no joke. I've seen ppl fork out good money to get their data back. It always originates to opening something they shouldn't have.
Google drive or drop box (we use both, but pay only for g drive. Is nice to have essentially a dfs (distributed file system), as they sync the files between all the pc's. Bad thing is it does nothing to keep the crypto from syncing up as well. No drop box has history of the files so that would help, also help if you mess up an art file and save over it losing the better/original work. I'm not sure if google has this, I need to look.
That said, we also use a raid 3, but in all honesty, it's down right now because the boot drive took a crap on me... At least I think that's all... Haven't had the time to really dig in and see. This is a fairly easy fix for me, but might not be for those that aren't the computer nerd that I am.
I'd say that a combination of could storage like drop box or google drive with either another off site back up that runs over night or at least something that something like crypto can't spread easily and infect. This gets your files at least backed up from the day before.
Usual recipe I do for my clients is weekly FULL backup sometime over the weekend (this overwrites the previous weeks full backup) and then incremental backups daily (this backs up only what has changed since the full). Then on the 1st of each month we do a FULL permanent and keep that forever. As space fills up we off load those to long term storage. This is just a base, we tweak from there based on particular clients needs. Example full backups with you guys might get pretty large and hard to justify keeping month after month perm backups. The main benefit is that sometimes you don't realize something disappeared or got current till months later when you need that file again and these perm backups are nice to dig back into.
It's all a delicate balance, but you don't want to be like my buddy with a multi-disc array of 7 gigs of data and one drive takes a dump and his back up has corrupt folders.... He's now looking at $2,400 bucks to get those drives back in order.