I think if you are really a serious crypto investors, putting your wallet.dat on cloud storage in the last thing you should do. Be creative, buy a solid commercialised safety box, or even get one in a back for you the safe keeping of you hardware backups.

Sooner or later hackers will find a way to exploit cloud system (if they haven't done so) so it's not really recommend to do it, in my opinion. Hackers are not just evolving, they are always two steps ahead on this game.