Which is true for local storage as well. If fact, I will argue that data on cloud is more reliable than data on my local machine. I carry it all the time, I don't have back up for a large part of it (I use versioning for code, everything else is painful); I did have some backups on external storage devices but they are more prone to faults and crashes than my internal drives. Carrying such devices around is a major hassle - actively taking backups is an even bigger task!