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You can copy the db file from one phone to another and have all your chats sync up

Even on iOS devices?

No, but you can't use Google drive either on iPhones, IIRC.

No you can't. You can only use iCloud which is not 100% secure AFAIK.

Why iCloud it’s not %100 secure?

Though, it is possible that WhatsApp is encrypting backups before uploading them to iCloud.