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Google Drive misplaces months' worth of customer files
(www.theregister.com)
This is a most excellent place for technology news and articles.
Google is fine for most people, but it shouldn't be the sole backup. If you don't have (at least) 3 separate instances of a backup, you don't really have a reliable backup strategy. Preferably an onsite hard backup, an offsite hard backup, and a cloud backup.
I know quite a few tech oriented people and I don't know anyone who actually has the holy trinity of backups. I know quite a few who have physical backups at home and cloud though.
Considering data durability for some data services are providing 11 9’s, just two of those leads to extremely high durability. So to say that is unreliable is just not reasonable. I have no problem with being risk averse but that is a bit extreme.