I was wiping and restoring a family member's Android phone today, as it was running slowly with loads of apps on it.
I decided to back up their WhatsApp messages to Google Drive in order to recreate their chat history easily after the wipe.
On the phone, I noticed this message from WhatsApp:
Important: Media and messages you back up are not protected by WhatsApp end-to-end encryption while in Google Drive.
The same message is also available here, at the end of the section for
Creating a Google Drive Backup:
Does this mean that if I have been chatting to anyone in the past, and that person has periodic Google Drive backups enabled, then my conversation is compromised to Google and/or WhatsApp?
If this is the case then it actually makes end-to-end encryption on WhatsApp useless unless the person you're chatting to swears that they don't have Google Drive backup enabled on their end. We might as well just use server-side encryption.
Or is the message given by WhatsApp badly expressed and ambiguous?