Ask HN: Are cloud storage services safe for legal personal documents?

I mean specifically things like tax returns, passport scans, driver license scans, and things of that nature.

I work in software, and I know that no systems are ever 100% secure. As long as something is online, there is a probability of being hacked into.

Having that said, are services like Google Drive, Dropbox, Box, etc. "secure enough" for storing said backup documents?

This comes up as a question I have after the thread about house possibly being burned down. The urban part of Bay Area is currently not completely safe from the fires, even though we're at a lower risk than areas around Santa Rosa.