many, but afaik still not all. when they released encryption it only worked when all involved clients were android (or ios i dont remember)

My grandmother uses a Nokia C3. Until she switches, every group in which she participates will not be encrypted.

It says on the Nokia C3 version of the app that Whatsapp won't support that device next year, possibly because of that.

You can backup WhatsApp chat history on iCloud.

>You can store it

I didn't say you can't, I said Whatsapp doesn't store it. I meant to say that it won't automatically backup and restore your stuff when you change phones.

You have to backup the data yourself in an sd card or a cloud service that you choose. It isn't stored in Facebook's servers.