Whatsapp and whatsapp business chat backuo.

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Hello,

I want to know how whatsapp backup system works.

I recently get virtual numbers for testing and after send couple of messages and pictures with customers I deleted the number and get another virtual number. I think I also backup before deleting the chat just for the test then I deleted the number and try another new number.

if those numbers definitely using by other people in the future do they get my backup without my email address? or they just type the number and automatically they will see my chats on they are phones?