Nothing is 100%. I've always questioned using the cloud without encryption. I use the services like offsite backups. The bottom line is that it is your data

Nothing is 100%. I've always questioned using the cloud without encryption. I use the services like offsite backups. The bottom line is that it is your data and your responsibility to ensure your work is backed up and recoverable. Really for how long Google has operated drive, it has as good a record as one could ask for. Stuff happens, Murphy's law and stuff.