“Hacking” of public email systems is not difficult, and I would go so far to say that Google probably gave backdoor access to government agencies. Bottom line, don’t store anything critical on public infrastructure such as Google, Amazon, Yahoo, etc.
If you need to save critical documents, either print them and file them in triplicate or have at least 3 soft copies of them (i.e. CD/DVD, thumb drive, and computer hard drive).
Everything including titles to real estate has been put on the folking cloud.
Real lawyers are keeping paper copies of all of it in case
Diplomatic Security Service criminal investigator was a dumbass if he didn’t think that could happen and didn’t backup in ways you say.
Don't forget to encrypt the files with a sufficiently secure password...